App.xaml

<Application x:Class="trimr.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:trimr"
             xmlns:hc="https://handyorg.github.io/handycontrol"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="pack://application:,,,/HandyControl;component/Themes/SkinDefault.xaml"/>
                <ResourceDictionary Source="pack://application:,,,/HandyControl;component/Themes/Theme.xaml"/>
                <hc:Theme Skin="Dark"/>
            </ResourceDictionary.MergedDictionaries>
            <Style x:Key="{x:Type TextBlock}" TargetType="{x:Type TextBlock}">
                <Setter Property="Foreground" Value="White"/>
                <Setter Property="FontSize" Value="12"/>
            </Style>
        </ResourceDictionary>
    </Application.Resources>
</Application>