How to direct the dark theme

[HubTonight]

How to direct the dark theme

<Application x:Class="TruckBraking.View.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:hc="https://handyorg.github.io/handycontrol"
             xmlns:local="clr-namespace:TruckBraking.View">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>

                <hc:ThemeResources />
                <!--<hc:Theme />-->
                <ResourceDictionary Source="pack://application:,,,/HandyControl;component/Themes/Theme.xaml" />
                <!-- Other merged dictionaries here -->

                <ResourceDictionary Source="Styles/Colors.xaml" />
                <ResourceDictionary Source="Styles/Fonts.xaml" />
                <ResourceDictionary Source="Styles/Texts.xaml" />
                <ResourceDictionary Source="Styles/Buttons.xaml" />

            </ResourceDictionary.MergedDictionaries>
            <!-- Other app resources here -->
        </ResourceDictionary>
    </Application.Resources>
</Application>

[HubTonight]

Here are the instructions