Added Windows.Forms.App to UnitTest to help test visual controls

UnitTests/Windows.Forms.App/Form1.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Data;
+using System.Linq;
+using System.Reflection;
+using System.Windows.Forms;
+
+namespace Windows.Forms.App
+{
+	public partial class Form1 : Form
+	{
+		private object currentDlg;
+
+		public Form1()
+		{
+			InitializeComponent();
+			FillComboWithDialogs(dlgCombo);
+		}
+
+		private static void FillComboWithDialogs(ComboBox cb) => cb.Items.AddRange(Assembly.GetAssembly(typeof(Vanara.Windows.Forms.AccessControlEditorDialog)).GetTypes().Where(t => !t.IsNested && typeof(CommonDialog).IsAssignableFrom(t) || typeof(Form).IsAssignableFrom(t)).ToArray());
+
+		private void button1_Click(object sender, EventArgs e)
+		{
+			if (currentDlg is null) return;
+			try
+			{
+				if (currentDlg is CommonDialog c)
+					c.ShowDialog();
+				else if (currentDlg is Form f)
+					f.ShowDialog();
+			}
+			catch (Exception ex)
+			{
+				MessageBox.Show(ex.ToString(), null, MessageBoxButtons.OK, MessageBoxIcon.Error);
+			}
+		}
+
+		private void dlgCombo_SelectedIndexChanged(object sender, EventArgs e)
+		{
+			currentDlg = dlgCombo.SelectedItem is null ? null : Activator.CreateInstance((Type)dlgCombo.SelectedItem);
+			propertyGrid1.SelectedObject = currentDlg;
+		}
+	}
+}