diff --git a/Canvas.go b/Canvas.go
index b329291b..e4590628 100644
--- a/Canvas.go
+++ b/Canvas.go
@@ -75,7 +75,7 @@ func (c *Canvas) AddRectFilled(pMin, pMax image.Point, col color.Color, rounding
 
 // AddText draws text.
 func (c *Canvas) AddText(pos image.Point, col color.Color, text string) {
-	c.drawlist.AddText(ToVec2(pos), ToVec4Color(col), Context.FontAtlas.tStr(text))
+	c.drawlist.AddText(ToVec2(pos), ToVec4Color(col), Context.FontAtlas.RegisterString(text))
 }
 
 // AddBezierCubic draws bezier cubic.
diff --git a/ClickableWidgets.go b/ClickableWidgets.go
index 0181b0ae..3ad11e08 100644
--- a/ClickableWidgets.go
+++ b/ClickableWidgets.go
@@ -63,7 +63,7 @@ func (b *ButtonWidget) Build() {
 		defer imgui.EndDisabled()
 	}
 
-	if imgui.ButtonV(Context.FontAtlas.tStr(b.id), imgui.Vec2{X: b.width, Y: b.height}) && b.onClick != nil {
+	if imgui.ButtonV(Context.FontAtlas.RegisterString(b.id), imgui.Vec2{X: b.width, Y: b.height}) && b.onClick != nil {
 		b.onClick()
 	}
 }
@@ -135,7 +135,7 @@ func (b *SmallButtonWidget) OnClick(onClick func()) *SmallButtonWidget {
 
 // Build implements Widget interface.
 func (b *SmallButtonWidget) Build() {
-	if imgui.SmallButton(Context.FontAtlas.tStr(b.id)) && b.onClick != nil {
+	if imgui.SmallButton(Context.FontAtlas.RegisterString(b.id)) && b.onClick != nil {
 		b.onClick()
 	}
 }
@@ -182,7 +182,7 @@ func (b *InvisibleButtonWidget) ID(id string) *InvisibleButtonWidget {
 
 // Build implements Widget interface.
 func (b *InvisibleButtonWidget) Build() {
-	if imgui.InvisibleButton(Context.FontAtlas.tStr(b.id), imgui.Vec2{X: b.width, Y: b.height}) && b.onClick != nil {
+	if imgui.InvisibleButton(Context.FontAtlas.RegisterString(b.id), imgui.Vec2{X: b.width, Y: b.height}) && b.onClick != nil {
 		b.onClick()
 	}
 }
@@ -371,7 +371,7 @@ func (c *CheckboxWidget) OnChange(onChange func()) *CheckboxWidget {
 
 // Build implements Widget interface.
 func (c *CheckboxWidget) Build() {
-	if imgui.Checkbox(Context.FontAtlas.tStr(c.text), c.selected) && c.onChange != nil {
+	if imgui.Checkbox(Context.FontAtlas.RegisterString(c.text), c.selected) && c.onChange != nil {
 		c.onChange()
 	}
 }
@@ -404,7 +404,7 @@ func (r *RadioButtonWidget) OnChange(onChange func()) *RadioButtonWidget {
 
 // Build implements Widget interface.
 func (r *RadioButtonWidget) Build() {
-	if imgui.RadioButton(Context.FontAtlas.tStr(r.text), r.active) && r.onChange != nil {
+	if imgui.RadioButton(Context.FontAtlas.RegisterString(r.text), r.active) && r.onChange != nil {
 		r.onChange()
 	}
 }
@@ -479,7 +479,7 @@ func (s *SelectableWidget) Build() {
 		s.flags |= SelectableFlagsAllowDoubleClick
 	}
 
-	if imgui.SelectableV(Context.FontAtlas.tStr(s.label), s.selected, int(s.flags), imgui.Vec2{X: s.width, Y: s.height}) && s.onClick != nil {
+	if imgui.SelectableV(Context.FontAtlas.RegisterString(s.label), s.selected, int(s.flags), imgui.Vec2{X: s.width, Y: s.height}) && s.onClick != nil {
 		s.onClick()
 	}
 
@@ -503,7 +503,7 @@ type TreeNodeWidget struct {
 // TreeNode creates a new tree node widget.
 func TreeNode(label string) *TreeNodeWidget {
 	return &TreeNodeWidget{
-		label:        Context.FontAtlas.tStr(label),
+		label:        Context.FontAtlas.RegisterString(label),
 		flags:        0,
 		layout:       nil,
 		eventHandler: nil,
diff --git a/CodeEditor.go b/CodeEditor.go
index 5f2cdc61..426e8cfd 100644
--- a/CodeEditor.go
+++ b/CodeEditor.go
@@ -197,7 +197,7 @@ func (ce *CodeEditorWidget) Build() {
 	s := ce.getState()
 
 	// register text in font atlas
-	Context.FontAtlas.tStr(s.editor.GetText())
+	Context.FontAtlas.RegisterString(s.editor.GetText())
 
 	// build editor
 	s.editor.Render(ce.title, imgui.Vec2{X: ce.width, Y: ce.height}, ce.border)
diff --git a/ExtraWidgets.go b/ExtraWidgets.go
index 524ed6a7..8dddd302 100644
--- a/ExtraWidgets.go
+++ b/ExtraWidgets.go
@@ -192,10 +192,10 @@ func (ttr *TreeTableRowWidget) BuildTreeTableRow() {
 
 	open := false
 	if len(ttr.children) > 0 {
-		open = imgui.TreeNodeV(Context.FontAtlas.tStr(ttr.label), int(ttr.flags))
+		open = imgui.TreeNodeV(Context.FontAtlas.RegisterString(ttr.label), int(ttr.flags))
 	} else {
 		ttr.flags |= TreeNodeFlagsLeaf | TreeNodeFlagsNoTreePushOnOpen
-		imgui.TreeNodeV(Context.FontAtlas.tStr(ttr.label), int(ttr.flags))
+		imgui.TreeNodeV(Context.FontAtlas.RegisterString(ttr.label), int(ttr.flags))
 	}
 
 	for _, w := range ttr.layout {
@@ -571,7 +571,7 @@ func (d *DatePickerWidget) Build() {
 		const yearButtonSize = 25
 
 		Row(
-			Label(Context.FontAtlas.tStr(" Year")),
+			Label(Context.FontAtlas.RegisterString(" Year")),
 			Labelf("%14d", d.date.Year()),
 			Button("-##"+d.id+"year").OnClick(func() {
 				*d.date = d.date.AddDate(-1, 0, 0)
diff --git a/FontAtlasProsessor.go b/FontAtlasProsessor.go
index 241b40ce..d009d160 100644
--- a/FontAtlasProsessor.go
+++ b/FontAtlasProsessor.go
@@ -14,7 +14,6 @@ import (
 const (
 	preRegisterString = " \"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"
 	windows           = "windows"
-	defaultFontSize   = 14
 )
 
 // FontInfo represents a giu implementation of imgui font.
@@ -61,7 +60,7 @@ func newFontAtlas() FontAtlas {
 	}
 
 	// Pre register numbers
-	result.tStr(preRegisterString)
+	result.RegisterString(preRegisterString)
 
 	// Pre-register fonts
 	switch runtime.GOOS {
@@ -193,9 +192,9 @@ func (a *FontAtlas) registerDefaultFonts(fontInfos []FontInfo) {
 	}
 }
 
-// Register string to font atlas builder.
+// RegisterString register string to font atlas builder.
 // Note only register strings that will be displayed on the UI.
-func (a *FontAtlas) tStr(str string) string {
+func (a *FontAtlas) RegisterString(str string) string {
 	for _, s := range str {
 		if _, ok := a.stringMap.Load(s); !ok {
 			a.stringMap.Store(s, false)
@@ -206,16 +205,17 @@ func (a *FontAtlas) tStr(str string) string {
 	return str
 }
 
-// Register string pointer to font atlas builder.
+// RegisterStringPointer registers string pointer to font atlas builder.
 // Note only register strings that will be displayed on the UI.
-func (a *FontAtlas) tStrPtr(str *string) *string {
-	a.tStr(*str)
+func (a *FontAtlas) RegisterStringPointer(str *string) *string {
+	a.RegisterString(*str)
 	return str
 }
 
-func (a *FontAtlas) tStrSlice(str []string) []string {
+// RegisterStringSlice calls RegisterString for each slice element
+func (a *FontAtlas) RegisterStringSlice(str []string) []string {
 	for _, s := range str {
-		a.tStr(s)
+		a.RegisterString(s)
 	}
 
 	return str
diff --git a/ImageWidgets.go b/ImageWidgets.go
index e411a1d2..11453011 100644
--- a/ImageWidgets.go
+++ b/ImageWidgets.go
@@ -21,7 +21,7 @@ type ImageWidget struct {
 	texture                *Texture
 	width                  float32
 	height                 float32
-	uv0, uv1               image.Point
+	uv0, uv1               imgui.Vec2
 	tintColor, borderColor color.Color
 	onClick                func()
 }
@@ -32,16 +32,16 @@ func Image(texture *Texture) *ImageWidget {
 		texture:     texture,
 		width:       100,
 		height:      100,
-		uv0:         image.Point{X: 0, Y: 0},
-		uv1:         image.Point{X: 1, Y: 1},
+		uv0:         imgui.Vec2{X: 0, Y: 0},
+		uv1:         imgui.Vec2{X: 1, Y: 1},
 		tintColor:   color.RGBA{255, 255, 255, 255},
 		borderColor: color.RGBA{0, 0, 0, 0},
 	}
 }
 
 // Uv allows to specify uv parameters.
-func (i *ImageWidget) Uv(uv0, uv1 image.Point) *ImageWidget {
-	i.uv0, i.uv1 = uv0, uv1
+func (i *ImageWidget) Uv(uv0X, uv0Y, uv1X, uv1Y float32) *ImageWidget {
+	i.uv0.X, i.uv0.Y, i.uv1.X, i.uv1.Y = uv0X, uv0Y, uv1X, uv1Y
 	return i
 }
 
@@ -88,7 +88,7 @@ func (i *ImageWidget) Build() {
 	}
 
 	// trick: detect click event
-	if i.onClick != nil && IsMouseClicked(MouseButtonLeft) {
+	if i.onClick != nil && IsMouseClicked(MouseButtonLeft) && IsWindowFocused(0) {
 		cursorPos := GetCursorScreenPos()
 		mousePos := GetMousePos()
 		mousePos.Add(cursorPos)
@@ -98,7 +98,7 @@ func (i *ImageWidget) Build() {
 		}
 	}
 
-	imgui.ImageV(i.texture.id, size, ToVec2(i.uv0), ToVec2(i.uv1), ToVec4Color(i.tintColor), ToVec4Color(i.borderColor))
+	imgui.ImageV(i.texture.id, size, i.uv0, i.uv1, ToVec4Color(i.tintColor), ToVec4Color(i.borderColor))
 }
 
 type imageState struct {
@@ -138,6 +138,12 @@ func ImageWithRgba(rgba image.Image) *ImageWithRgbaWidget {
 	}
 }
 
+// ID sets the interval id of ImageWithRgba widgets.
+func (i *ImageWithRgbaWidget) ID(id string) *ImageWithRgbaWidget {
+	i.id = id
+	return i
+}
+
 // Size sets image's size.
 func (i *ImageWithRgbaWidget) Size(width, height float32) *ImageWithRgbaWidget {
 	i.img.Size(width, height)
@@ -195,6 +201,12 @@ func ImageWithFile(imgPath string) *ImageWithFileWidget {
 	}
 }
 
+// ID sets the interval id of ImageWithFile widgets.
+func (i *ImageWithFileWidget) ID(id string) *ImageWithFileWidget {
+	i.id = id
+	return i
+}
+
 // Size sets image's size.
 func (i *ImageWithFileWidget) Size(width, height float32) *ImageWithFileWidget {
 	i.img.Size(width, height)
diff --git a/InputHandler.go b/InputHandler.go
index f951f773..c9172971 100644
--- a/InputHandler.go
+++ b/InputHandler.go
@@ -29,6 +29,8 @@ const (
 	LocalShortcut ShortcutType = false
 )
 
+type InputHandlerHandleCallback func(Key, Modifier, Action)
+
 // InputHandler is an interface which needs to be implemented
 // by user-definied input handlers.
 type InputHandler interface {
@@ -37,7 +39,7 @@ type InputHandler interface {
 	// UnregisterKeyboardShortcuts removes iwndow shourtcuts from input handler
 	UnregisterWindowShortcuts()
 	// Handle handles a shortcut
-	Handle(Key, Modifier)
+	Handle(Key, Modifier, Action)
 }
 
 // --- Default implementation of giu input manager ---
@@ -79,7 +81,11 @@ func (i *inputHandler) UnregisterWindowShortcuts() {
 	}
 }
 
-func (i *inputHandler) Handle(key Key, mod Modifier) {
+func (i *inputHandler) Handle(key Key, mod Modifier, a Action) {
+	if a != Press {
+		return
+	}
+
 	for combo, cb := range i.shortcuts {
 		if combo.key != key || combo.modifier != mod {
 			continue
diff --git a/InputHandler_test.go b/InputHandler_test.go
index 544aedd9..87561cb3 100644
--- a/InputHandler_test.go
+++ b/InputHandler_test.go
@@ -86,13 +86,13 @@ func Test_InputHandler_Handle(t *testing.T) {
 
 	i.RegisterKeyboardShortcuts(sh...)
 
-	i.Handle(Key(0), Modifier(0))
+	i.Handle(Key(0), Modifier(0), Press)
 	a.False(shortcut1, "Shortcut 1 was handled, but shouldn't.")
 	a.False(shortcut2, "Shortcut 2 was handled, but shouldn't.")
-	i.Handle(Key(5), Modifier(0))
+	i.Handle(Key(5), Modifier(0), Press)
 	a.True(shortcut1, "Shortcut 1 was not handled, but shouldn be.")
 	a.False(shortcut2, "Shortcut 2 was handled, but shouldn't.")
-	i.Handle(Key(8), Modifier(2))
+	i.Handle(Key(8), Modifier(2), Press)
 	a.True(shortcut1, "Shortcut 1 was not handled, but shouldn be.")
 	a.True(shortcut2, "Shortcut 2 was not handled, but shouldn be.")
 }
diff --git a/Keycode.go b/Keycode.go
index e54a125c..a861814f 100644
--- a/Keycode.go
+++ b/Keycode.go
@@ -146,3 +146,11 @@ const (
 	ModCapsLock Modifier = Modifier(glfw.ModCapsLock)
 	ModNumLock  Modifier = Modifier(glfw.ModNumLock)
 )
+
+type Action glfw.Action
+
+const (
+	Release Action = Action(glfw.Release)
+	Press   Action = Action(glfw.Press)
+	Repeat  Action = Action(glfw.Repeat)
+)
diff --git a/Markdown.go b/Markdown.go
index 71b80994..d14eb4ea 100644
--- a/Markdown.go
+++ b/Markdown.go
@@ -59,7 +59,7 @@ func (m *MarkdownWidget) Header(level int, font *FontInfo, separator bool) *Mark
 
 // Build implements Widget interface.
 func (m *MarkdownWidget) Build() {
-	imgui.Markdown(Context.FontAtlas.tStrPtr(m.md), m.linkCb, loadImage, m.headers)
+	imgui.Markdown(Context.FontAtlas.RegisterStringPointer(m.md), m.linkCb, loadImage, m.headers)
 }
 
 func loadImage(path string) imgui.MarkdownImageData {
diff --git a/MasterWindow.go b/MasterWindow.go
index ae7a8fbf..2c621c1c 100644
--- a/MasterWindow.go
+++ b/MasterWindow.go
@@ -44,6 +44,10 @@ type MasterWindow struct {
 	context    *imgui.Context
 	io         *imgui.IO
 	updateFunc func()
+
+	// possibility to expend InputHandler's stuff
+	// See SetAdditionalInputHandler
+	additionalInputCallback InputHandlerHandleCallback
 }
 
 // NewMasterWindow creates a new master window and initializes GLFW.
@@ -376,8 +380,16 @@ func (w *MasterWindow) SetShouldClose(v bool) {
 func (w *MasterWindow) SetInputHandler(handler InputHandler) {
 	Context.InputHandler = handler
 	w.platform.SetInputCallback(func(key glfw.Key, modifier glfw.ModifierKey, action glfw.Action) {
-		if action == glfw.Press {
-			handler.Handle(Key(key), Modifier(modifier))
+		k, m, a := Key(key), Modifier(modifier), Action(action)
+		handler.Handle(k, m, a)
+		if w.additionalInputCallback != nil {
+			w.additionalInputCallback(k, m, a)
 		}
 	})
 }
+
+// SetAdditionalInputHandlerCallback allows to set an input callback to handle more events (not only these from giu.inputHandler).
+// See examples/issue-501.
+func (w *MasterWindow) SetAdditionalInputHandlerCallback(cb InputHandlerHandleCallback) {
+	w.additionalInputCallback = cb
+}
diff --git a/Plot.go b/Plot.go
index 9cffd484..125eebc1 100644
--- a/Plot.go
+++ b/Plot.go
@@ -176,11 +176,11 @@ func (p *PlotCanvasWidget) Build() {
 		}
 
 		if imgui.ImPlotBegin(
-			Context.FontAtlas.tStr(p.title), Context.FontAtlas.tStr(p.xLabel),
-			Context.FontAtlas.tStr(p.yLabel), ToVec2(image.Pt(p.width, p.height)),
+			Context.FontAtlas.RegisterString(p.title), Context.FontAtlas.RegisterString(p.xLabel),
+			Context.FontAtlas.RegisterString(p.yLabel), ToVec2(image.Pt(p.width, p.height)),
 			imgui.ImPlotFlags(p.flags), imgui.ImPlotAxisFlags(p.xFlags),
 			imgui.ImPlotAxisFlags(p.yFlags), imgui.ImPlotAxisFlags(p.y2Flags),
-			imgui.ImPlotAxisFlags(p.y3Flags), Context.FontAtlas.tStr(p.y2Label), Context.FontAtlas.tStr(p.y3Label),
+			imgui.ImPlotAxisFlags(p.y3Flags), Context.FontAtlas.RegisterString(p.y2Label), Context.FontAtlas.RegisterString(p.y3Label),
 		) {
 			for _, plot := range p.plots {
 				plot.Plot()
@@ -273,7 +273,7 @@ func (p *PlotBarHWidget) Offset(offset int) *PlotBarHWidget {
 
 // Plot implements plot interface.
 func (p *PlotBarHWidget) Plot() {
-	imgui.ImPlotBarsH(Context.FontAtlas.tStr(p.title), p.data, p.height, p.shift, p.offset)
+	imgui.ImPlotBarsH(Context.FontAtlas.RegisterString(p.title), p.data, p.height, p.shift, p.offset)
 }
 
 // PlotLineWidget represents a plot line (linear chart).
@@ -323,7 +323,7 @@ func (p *PlotLineWidget) Offset(offset int) *PlotLineWidget {
 // Plot implements Plot interface.
 func (p *PlotLineWidget) Plot() {
 	imgui.ImPlotSetPlotYAxis(imgui.ImPlotYAxis(p.yAxis))
-	imgui.ImPlotLine(Context.FontAtlas.tStr(p.title), p.values, p.xScale, p.x0, p.offset)
+	imgui.ImPlotLine(Context.FontAtlas.RegisterString(p.title), p.values, p.xScale, p.x0, p.offset)
 }
 
 // PlotLineXYWidget adds XY plot line.
@@ -359,7 +359,7 @@ func (p *PlotLineXYWidget) Offset(offset int) *PlotLineXYWidget {
 // Plot implements Plot interface.
 func (p *PlotLineXYWidget) Plot() {
 	imgui.ImPlotSetPlotYAxis(imgui.ImPlotYAxis(p.yAxis))
-	imgui.ImPlotLineXY(Context.FontAtlas.tStr(p.title), p.xs, p.ys, p.offset)
+	imgui.ImPlotLineXY(Context.FontAtlas.RegisterString(p.title), p.xs, p.ys, p.offset)
 }
 
 // PlotPieChartWidget represents a pie chart.
@@ -392,8 +392,8 @@ func (p *PlotPieChartWidget) Normalize(n bool) *PlotPieChartWidget {
 }
 
 // LabelFormat sets format of labels.
-func (p *PlotPieChartWidget) LabelFormat(fmtStr string) *PlotPieChartWidget {
-	p.labelFormat = fmtStr
+func (p *PlotPieChartWidget) LabelFormat(fmContext.FontAtlas.RegisterString string) *PlotPieChartWidget {
+	p.labelFormat = fmContext.FontAtlas.RegisterString
 	return p
 }
 
@@ -403,7 +403,7 @@ func (p *PlotPieChartWidget) Angle0(a float64) *PlotPieChartWidget {
 }
 
 func (p *PlotPieChartWidget) Plot() {
-	imgui.ImPlotPieChart(Context.FontAtlas.tStrSlice(p.labels), p.values, p.x, p.y, p.radius, p.normalize, p.labelFormat, p.angle0)
+	imgui.ImPlotPieChart(Context.FontAtlas.RegisterStringSlice(p.labels), p.values, p.x, p.y, p.radius, p.normalize, p.labelFormat, p.angle0)
 }
 
 type PlotScatterWidget struct {
@@ -439,7 +439,7 @@ func (p *PlotScatterWidget) Offset(offset int) *PlotScatterWidget {
 }
 
 func (p *PlotScatterWidget) Plot() {
-	imgui.ImPlotScatter(Context.FontAtlas.tStr(p.label), p.values, p.xscale, p.x0, p.offset)
+	imgui.ImPlotScatter(Context.FontAtlas.RegisterString(p.label), p.values, p.xscale, p.x0, p.offset)
 }
 
 type PlotScatterXYWidget struct {
@@ -463,5 +463,5 @@ func (p *PlotScatterXYWidget) Offset(offset int) *PlotScatterXYWidget {
 }
 
 func (p *PlotScatterXYWidget) Plot() {
-	imgui.ImPlotScatterXY(Context.FontAtlas.tStr(p.label), p.xs, p.ys, p.offset)
+	imgui.ImPlotScatterXY(Context.FontAtlas.RegisterString(p.label), p.xs, p.ys, p.offset)
 }
diff --git a/Popups.go b/Popups.go
index b74c7b1f..7fa25dcb 100644
--- a/Popups.go
+++ b/Popups.go
@@ -29,7 +29,7 @@ type PopupWidget struct {
 // Popup creates new popup widget.
 func Popup(name string) *PopupWidget {
 	return &PopupWidget{
-		name:   Context.FontAtlas.tStr(name),
+		name:   Context.FontAtlas.RegisterString(name),
 		flags:  0,
 		layout: nil,
 	}
@@ -69,7 +69,7 @@ type PopupModalWidget struct {
 // PopupModal creates new popup modal widget.
 func PopupModal(name string) *PopupModalWidget {
 	return &PopupModalWidget{
-		name:   Context.FontAtlas.tStr(name),
+		name:   Context.FontAtlas.RegisterString(name),
 		open:   nil,
 		flags:  WindowFlagsNoResize,
 		layout: nil,
diff --git a/ProgressIndicator.go b/ProgressIndicator.go
index db9b63d5..28128f18 100644
--- a/ProgressIndicator.go
+++ b/ProgressIndicator.go
@@ -95,7 +95,7 @@ func (p *ProgressIndicatorWidget) Build() {
 
 				// Draw text
 				if len(p.label) > 0 {
-					labelWidth, _ := CalcTextSize(Context.FontAtlas.tStr(p.label))
+					labelWidth, _ := CalcTextSize(Context.FontAtlas.RegisterString(p.label))
 					labelPos := centerPt.Add(image.Pt(-1*int(labelWidth/2), int(p.radius+p.radius/5+8)))
 					canvas.AddText(labelPos, rgba, p.label)
 				}
diff --git a/README.md b/README.md
index 5e0eadcf..1461351e 100644
--- a/README.md
+++ b/README.md
@@ -192,7 +192,7 @@ brew install mingw-w64
 on Linux:
 
 ```sh
-sudo dnf install mingw64-gcc mingw64-gcc-c++ mingw-winpthreads-static
+sudo dnf install mingw64-gcc mingw64-gcc-c++ mingw64-winpthreads-static
 ```
 
 2. Prepare and embed the application icon into the executable and build.
diff --git a/SliderWidgets.go b/SliderWidgets.go
index 24060076..e6ac798e 100644
--- a/SliderWidgets.go
+++ b/SliderWidgets.go
@@ -55,7 +55,7 @@ func (s *SliderIntWidget) OnChange(onChange func()) *SliderIntWidget {
 
 // Label sets slider label (id).
 func (s *SliderIntWidget) Label(label string) *SliderIntWidget {
-	s.label = Context.FontAtlas.tStr(label)
+	s.label = Context.FontAtlas.RegisterString(label)
 	return s
 }
 
@@ -71,7 +71,7 @@ func (s *SliderIntWidget) Build() {
 		defer PopItemWidth()
 	}
 
-	if imgui.SliderIntV(Context.FontAtlas.tStr(s.label), s.value, s.min, s.max, s.format) && s.onChange != nil {
+	if imgui.SliderIntV(Context.FontAtlas.RegisterString(s.label), s.value, s.min, s.max, s.format) && s.onChange != nil {
 		s.onChange()
 	}
 }
@@ -131,7 +131,7 @@ func (vs *VSliderIntWidget) OnChange(onChange func()) *VSliderIntWidget {
 
 // Label sets slider's label (id).
 func (vs *VSliderIntWidget) Label(label string) *VSliderIntWidget {
-	vs.label = Context.FontAtlas.tStr(label)
+	vs.label = Context.FontAtlas.RegisterString(label)
 	return vs
 }
 
@@ -143,7 +143,7 @@ func (vs *VSliderIntWidget) Labelf(format string, args ...any) *VSliderIntWidget
 // Build implements Widget interface.
 func (vs *VSliderIntWidget) Build() {
 	if imgui.VSliderIntV(
-		Context.FontAtlas.tStr(vs.label),
+		Context.FontAtlas.RegisterString(vs.label),
 		imgui.Vec2{X: vs.width, Y: vs.height},
 		vs.value,
 		vs.min,
@@ -204,7 +204,7 @@ func (sf *SliderFloatWidget) Size(width float32) *SliderFloatWidget {
 
 // Label sets slider's label (id).
 func (sf *SliderFloatWidget) Label(label string) *SliderFloatWidget {
-	sf.label = Context.FontAtlas.tStr(label)
+	sf.label = Context.FontAtlas.RegisterString(label)
 	return sf
 }
 
@@ -220,7 +220,7 @@ func (sf *SliderFloatWidget) Build() {
 		defer PopItemWidth()
 	}
 
-	if imgui.SliderFloatV(Context.FontAtlas.tStr(sf.label), sf.value, sf.min, sf.max, sf.format, 1.0) && sf.onChange != nil {
+	if imgui.SliderFloatV(Context.FontAtlas.RegisterString(sf.label), sf.value, sf.min, sf.max, sf.format, 1.0) && sf.onChange != nil {
 		sf.onChange()
 	}
 }
diff --git a/SplitLayout.go b/SplitLayout.go
index 30969260..e74fedae 100644
--- a/SplitLayout.go
+++ b/SplitLayout.go
@@ -19,8 +19,7 @@ const (
 var _ Disposable = &splitLayoutState{}
 
 type splitLayoutState struct {
-	delta   float32
-	sashPos float32
+	delta float32
 }
 
 // Dispose implements disposable interface.
@@ -39,12 +38,12 @@ type SplitLayoutWidget struct {
 	originItemSpacingY  float32
 	originFramePaddingX float32
 	originFramePaddingY float32
-	sashPos             float32
+	sashPos             *float32
 	border              bool
 }
 
 // SplitLayout creates split layout widget.
-func SplitLayout(direction SplitDirection, sashPos float32, layout1, layout2 Widget) *SplitLayoutWidget {
+func SplitLayout(direction SplitDirection, sashPos *float32, layout1, layout2 Widget) *SplitLayoutWidget {
 	return &SplitLayoutWidget{
 		direction: direction,
 		sashPos:   sashPos,
@@ -75,34 +74,34 @@ func (s *SplitLayoutWidget) Build() {
 
 	var layout Layout
 
-	splitLayoutState.sashPos += splitLayoutState.delta
-	if splitLayoutState.sashPos < 1 {
-		splitLayoutState.sashPos = 1
+	*s.sashPos += splitLayoutState.delta
+	if *s.sashPos < 1 {
+		*s.sashPos = 1
 	}
 
 	switch s.direction {
 	case DirectionHorizontal:
-		availableW, _ := GetAvailableRegion()
-		if splitLayoutState.sashPos >= availableW {
-			splitLayoutState.sashPos = availableW
+		_, availableH := GetAvailableRegion()
+		if *s.sashPos >= availableH {
+			*s.sashPos = availableH
 		}
 
 		layout = Layout{
-			Row(
-				s.buildChild(splitLayoutState.sashPos, 0, s.layout1),
-				VSplitter(&(splitLayoutState.delta)).Size(s.originItemSpacingX, 0),
+			Column(
+				s.buildChild(Auto, *s.sashPos, s.layout1),
+				HSplitter(&(splitLayoutState.delta)).Size(0, s.originItemSpacingY),
 				s.buildChild(Auto, Auto, s.layout2),
 			),
 		}
 	case DirectionVertical:
-		_, availableH := GetAvailableRegion()
-		if splitLayoutState.sashPos >= availableH {
-			splitLayoutState.sashPos = availableH
+		availableW, _ := GetAvailableRegion()
+		if *s.sashPos >= availableW {
+			*s.sashPos = availableW
 		}
 		layout = Layout{
-			Column(
-				s.buildChild(Auto, splitLayoutState.sashPos, s.layout1),
-				HSplitter(&(splitLayoutState.delta)).Size(0, s.originItemSpacingY),
+			Row(
+				s.buildChild(*s.sashPos, 0, s.layout1),
+				VSplitter(&(splitLayoutState.delta)).Size(s.originItemSpacingX, 0),
 				s.buildChild(Auto, Auto, s.layout2),
 			),
 		}
@@ -161,7 +160,7 @@ func (s *SplitLayoutWidget) buildChild(width, height float32, layout Widget) Wid
 
 func (s *SplitLayoutWidget) getState() (state *splitLayoutState) {
 	if st := Context.GetState(s.id); st == nil {
-		state = &splitLayoutState{delta: 0.0, sashPos: s.sashPos}
+		state = &splitLayoutState{delta: 0.0}
 		Context.SetState(s.id, state)
 	} else {
 		var isOk bool
diff --git a/TableWidgets.go b/TableWidgets.go
index 0a1a7ee5..ac18ff37 100644
--- a/TableWidgets.go
+++ b/TableWidgets.go
@@ -67,7 +67,7 @@ type TableColumnWidget struct {
 
 func TableColumn(label string) *TableColumnWidget {
 	return &TableColumnWidget{
-		label:              Context.FontAtlas.tStr(label),
+		label:              Context.FontAtlas.RegisterString(label),
 		flags:              0,
 		innerWidthOrWeight: 0,
 		userID:             0,
diff --git a/TextWidgets.go b/TextWidgets.go
index b4ea6f17..c893d804 100644
--- a/TextWidgets.go
+++ b/TextWidgets.go
@@ -72,8 +72,8 @@ func (i *InputTextMultilineWidget) Size(width, height float32) *InputTextMultili
 // Build implements Widget interface.
 func (i *InputTextMultilineWidget) Build() {
 	if imgui.InputTextMultilineV(
-		Context.FontAtlas.tStr(i.label),
-		Context.FontAtlas.tStrPtr(i.text),
+		Context.FontAtlas.RegisterString(i.label),
+		Context.FontAtlas.RegisterStringPtr(i.text),
 		imgui.Vec2{
 			X: i.width,
 			Y: i.height,
@@ -111,7 +111,7 @@ type BulletTextWidget struct {
 // BulletText creates bulletTextWidget.
 func BulletText(text string) *BulletTextWidget {
 	return &BulletTextWidget{
-		text: Context.FontAtlas.tStr(text),
+		text: Context.FontAtlas.RegisterString(text),
 	}
 }
 
@@ -165,7 +165,7 @@ func InputText(value *string) *InputTextWidget {
 
 // Label adds label (alternatively you can use it to set widget's id).
 func (i *InputTextWidget) Label(label string) *InputTextWidget {
-	i.label = Context.FontAtlas.tStr(label)
+	i.label = Context.FontAtlas.RegisterString(label)
 	return i
 }
 
@@ -183,7 +183,7 @@ func (i *InputTextWidget) AutoComplete(candidates []string) *InputTextWidget {
 
 // Hint sets hint text.
 func (i *InputTextWidget) Hint(hint string) *InputTextWidget {
-	i.hint = Context.FontAtlas.tStr(hint)
+	i.hint = Context.FontAtlas.RegisterString(hint)
 	return i
 }
 
@@ -229,7 +229,7 @@ func (i *InputTextWidget) Build() {
 		defer PopItemWidth()
 	}
 
-	isChanged := imgui.InputTextWithHint(i.label, i.hint, Context.FontAtlas.tStrPtr(i.value), int(i.flags), i.cb)
+	isChanged := imgui.InputTextWithHint(i.label, i.hint, Context.FontAtlas.RegisterStringPtr(i.value), int(i.flags), i.cb)
 
 	if isChanged && i.onChange != nil {
 		i.onChange()
@@ -295,7 +295,7 @@ func InputInt(value *int32) *InputIntWidget {
 
 // Label sets label (id).
 func (i *InputIntWidget) Label(label string) *InputIntWidget {
-	i.label = Context.FontAtlas.tStr(label)
+	i.label = Context.FontAtlas.RegisterString(label)
 	return i
 }
 
@@ -360,7 +360,7 @@ func InputFloat(value *float32) *InputFloatWidget {
 
 // Label sets label of input field.
 func (i *InputFloatWidget) Label(label string) *InputFloatWidget {
-	i.label = Context.FontAtlas.tStr(label)
+	i.label = Context.FontAtlas.RegisterString(label)
 	return i
 }
 
@@ -417,7 +417,7 @@ type LabelWidget struct {
 // Label constructs label widget.
 func Label(label string) *LabelWidget {
 	return &LabelWidget{
-		label:   Context.FontAtlas.tStr(label),
+		label:   Context.FontAtlas.RegisterString(label),
 		wrapped: false,
 	}
 }
diff --git a/Texture.go b/Texture.go
index 48dc6b64..b3ab2cc4 100644
--- a/Texture.go
+++ b/Texture.go
@@ -35,7 +35,6 @@ func EnqueueNewTextureFromRgba(rgba image.Image, loadCb func(t *Texture)) {
 
 // NewTextureFromRgba creates a new texture from image.Image and, when it is done, calls loadCallback(loadedTexture).
 func NewTextureFromRgba(rgba image.Image, loadCallback func(*Texture)) {
-	Assert(Context.isRunning, "", "NewTextureFromRgba", "cannot load texture befor (*MasterWindow).Run call!")
 	loadTexture(rgba, loadCallback)
 }
 
diff --git a/Widgets.go b/Widgets.go
index 1434cf5f..54f5aa68 100644
--- a/Widgets.go
+++ b/Widgets.go
@@ -130,7 +130,7 @@ type ComboCustomWidget struct {
 func ComboCustom(label, previewValue string) *ComboCustomWidget {
 	return &ComboCustomWidget{
 		label:        GenAutoID(label),
-		previewValue: Context.FontAtlas.tStr(previewValue),
+		previewValue: Context.FontAtlas.RegisterString(previewValue),
 		width:        0,
 		flags:        0,
 		layout:       nil,
@@ -162,7 +162,7 @@ func (cc *ComboCustomWidget) Build() {
 		defer imgui.PopItemWidth()
 	}
 
-	if imgui.BeginComboV(Context.FontAtlas.tStr(cc.label), cc.previewValue, int(cc.flags)) {
+	if imgui.BeginComboV(Context.FontAtlas.RegisterString(cc.label), cc.previewValue, int(cc.flags)) {
 		cc.layout.Build()
 		imgui.EndCombo()
 	}
@@ -186,8 +186,8 @@ type ComboWidget struct {
 func Combo(label, previewValue string, items []string, selected *int32) *ComboWidget {
 	return &ComboWidget{
 		label:        GenAutoID(label),
-		previewValue: Context.FontAtlas.tStr(previewValue),
-		items:        Context.FontAtlas.tStrSlice(items),
+		previewValue: Context.FontAtlas.RegisterString(previewValue),
+		items:        Context.FontAtlas.RegisterStringSlice(items),
 		selected:     selected,
 		flags:        0,
 		width:        0,
@@ -202,7 +202,7 @@ func (c *ComboWidget) Build() {
 		defer imgui.PopItemWidth()
 	}
 
-	if imgui.BeginComboV(Context.FontAtlas.tStr(c.label), c.previewValue, int(c.flags)) {
+	if imgui.BeginComboV(Context.FontAtlas.RegisterString(c.label), c.previewValue, int(c.flags)) {
 		for i, item := range c.items {
 			if imgui.Selectable(item) {
 				*c.selected = int32(i)
@@ -307,7 +307,7 @@ func (d *DragIntWidget) Format(format string) *DragIntWidget {
 
 // Build implements Widget interface.
 func (d *DragIntWidget) Build() {
-	imgui.DragIntV(Context.FontAtlas.tStr(d.label), d.value, d.speed, d.min, d.max, d.format)
+	imgui.DragIntV(Context.FontAtlas.RegisterString(d.label), d.value, d.speed, d.min, d.max, d.format)
 }
 
 var _ Widget = &ColumnWidget{}
@@ -422,7 +422,7 @@ func (m *MenuItemWidget) OnClick(onClick func()) *MenuItemWidget {
 
 // Build implements Widget interface.
 func (m *MenuItemWidget) Build() {
-	if imgui.MenuItemV(Context.FontAtlas.tStr(m.label), "", m.selected, m.enabled) && m.onClick != nil {
+	if imgui.MenuItemV(Context.FontAtlas.RegisterString(m.label), "", m.selected, m.enabled) && m.onClick != nil {
 		m.onClick()
 	}
 }
@@ -459,7 +459,7 @@ func (m *MenuWidget) Layout(widgets ...Widget) *MenuWidget {
 
 // Build implements Widget interface.
 func (m *MenuWidget) Build() {
-	if imgui.BeginMenuV(Context.FontAtlas.tStr(m.label), m.enabled) {
+	if imgui.BeginMenuV(Context.FontAtlas.RegisterString(m.label), m.enabled) {
 		m.layout.Build()
 		imgui.EndMenu()
 	}
@@ -489,7 +489,7 @@ func (p *ProgressBarWidget) Size(width, height float32) *ProgressBarWidget {
 }
 
 func (p *ProgressBarWidget) Overlay(overlay string) *ProgressBarWidget {
-	p.overlay = Context.FontAtlas.tStr(overlay)
+	p.overlay = Context.FontAtlas.RegisterString(overlay)
 	return p
 }
 
@@ -553,7 +553,7 @@ type TabItemWidget struct {
 
 func TabItem(label string) *TabItemWidget {
 	return &TabItemWidget{
-		label:  Context.FontAtlas.tStr(label),
+		label:  Context.FontAtlas.RegisterString(label),
 		open:   nil,
 		flags:  0,
 		layout: nil,
@@ -649,7 +649,7 @@ func (t *TooltipWidget) Build() {
 
 func Tooltip(tip string) *TooltipWidget {
 	return &TooltipWidget{
-		tip:    Context.FontAtlas.tStr(tip),
+		tip:    Context.FontAtlas.RegisterString(tip),
 		layout: nil,
 	}
 }
@@ -724,7 +724,7 @@ func (ce *ColorEditWidget) Build() {
 	}
 
 	if imgui.ColorEdit4V(
-		Context.FontAtlas.tStr(ce.label),
+		Context.FontAtlas.RegisterString(ce.label),
 		&col,
 		int(ce.flags),
 	) {
diff --git a/Window.go b/Window.go
index c8c0cfdc..2b3a5748 100644
--- a/Window.go
+++ b/Window.go
@@ -134,7 +134,7 @@ func (w *WindowWidget) Layout(widgets ...Widget) {
 		}),
 	)
 
-	showed := imgui.BeginV(Context.FontAtlas.tStr(w.title), w.open, int(w.flags))
+	showed := imgui.BeginV(Context.FontAtlas.RegisterString(w.title), w.open, int(w.flags))
 
 	if showed {
 		Layout(widgets).Build()
diff --git a/examples/canvas/gopher.png b/examples/canvas/gopher.png
index 2f1e3c42..e607ceac 100644
Binary files a/examples/canvas/gopher.png and b/examples/canvas/gopher.png differ
diff --git a/examples/gifdecode/golang.gif b/examples/gifdecode/golang.gif
index 23355aa1..a571f4aa 100644
Binary files a/examples/gifdecode/golang.gif and b/examples/gifdecode/golang.gif differ
diff --git a/examples/imguidemo/screenshot.png b/examples/imguidemo/screenshot.png
index eeee34d7..952c77c8 100644
Binary files a/examples/imguidemo/screenshot.png and b/examples/imguidemo/screenshot.png differ
diff --git a/examples/issue-501/main.go b/examples/issue-501/main.go
new file mode 100644
index 00000000..a9ff8412
--- /dev/null
+++ b/examples/issue-501/main.go
@@ -0,0 +1,37 @@
+package main
+
+import (
+	"github.com/AllenDang/giu"
+)
+
+var (
+	command     string
+	shouldFocus bool
+)
+
+func loop() {
+	giu.SingleWindow().Layout(
+		giu.Custom(func() {
+			if shouldFocus {
+				shouldFocus = false
+				giu.SetKeyboardFocusHere()
+			}
+		}),
+		giu.Row(
+			giu.InputText(&command).Size(200),
+			giu.Label("<- press any key to start typing here!"),
+		),
+	)
+}
+
+func onAnyKeyPressed(key giu.Key, mod giu.Modifier, action giu.Action) {
+	if action == giu.Press {
+		shouldFocus = true
+	}
+}
+
+func main() {
+	wnd := giu.NewMasterWindow("Handle any key event", 640, 480, 0)
+	wnd.SetAdditionalInputHandlerCallback(onAnyKeyPressed)
+	wnd.Run(loop)
+}
diff --git a/examples/loadimage/gopher.png b/examples/loadimage/gopher.png
index 2f1e3c42..80355628 100644
Binary files a/examples/loadimage/gopher.png and b/examples/loadimage/gopher.png differ
diff --git a/examples/markdown/gopher.png b/examples/markdown/gopher.png
index 2f1e3c42..9b8980b3 100644
Binary files a/examples/markdown/gopher.png and b/examples/markdown/gopher.png differ
diff --git a/examples/markdown/markdown.go b/examples/markdown/markdown.go
index 7c569e4c..aae88401 100644
--- a/examples/markdown/markdown.go
+++ b/examples/markdown/markdown.go
@@ -6,7 +6,10 @@ import (
 	"github.com/AllenDang/giu"
 )
 
-var markdown string = getExampleMarkdownText()
+var (
+	markdown       string  = getExampleMarkdownText()
+	splitLayoutPos float32 = 320
+)
 
 func getExampleMarkdownText() string {
 	return strings.Join([]string{
@@ -49,7 +52,7 @@ func getExampleMarkdownText() string {
 
 func loop() {
 	giu.SingleWindow().Layout(
-		giu.SplitLayout(giu.DirectionHorizontal, 320,
+		giu.SplitLayout(giu.DirectionHorizontal, &splitLayoutPos,
 			giu.Layout{
 				giu.Row(
 					giu.Label("Markdown Edition:"),
diff --git a/examples/splitter/SplitLayout.gif b/examples/splitter/SplitLayout.gif
index b7142e9a..eb8e2e81 100644
Binary files a/examples/splitter/SplitLayout.gif and b/examples/splitter/SplitLayout.gif differ
diff --git a/examples/splitter/splitter.go b/examples/splitter/splitter.go
index a48b7be8..2afa211e 100644
--- a/examples/splitter/splitter.go
+++ b/examples/splitter/splitter.go
@@ -4,18 +4,25 @@ import (
 	g "github.com/AllenDang/giu"
 )
 
+var (
+	sashPos1 float32 = 200
+	sashPos2 float32 = 200
+	sashPos3 float32 = 200
+	sashPos4 float32 = 100
+)
+
 func loop() {
 	g.SingleWindow().Layout(
-		g.SplitLayout(g.DirectionHorizontal, 200,
+		g.SplitLayout(g.DirectionHorizontal, &sashPos1,
 			g.Layout{
 				g.Label("Left panel"),
 				g.Row(g.Button("Button1"), g.Button("Button2")),
 			},
-			g.SplitLayout(g.DirectionVertical, 200,
+			g.SplitLayout(g.DirectionVertical, &sashPos2,
 				g.Layout{},
-				g.SplitLayout(g.DirectionHorizontal, 200,
+				g.SplitLayout(g.DirectionHorizontal, &sashPos3,
 					g.Layout{},
-					g.SplitLayout(g.DirectionVertical, 100,
+					g.SplitLayout(g.DirectionVertical, &sashPos4,
 						g.Layout{},
 						g.Layout{},
 					),
diff --git a/screenshots/SqlPower.png b/screenshots/SqlPower.png
index d9dcfb2c..d0a58455 100644
Binary files a/screenshots/SqlPower.png and b/screenshots/SqlPower.png differ