FISLib/FISSDK/FISSDKDemoV2/Resource/Style/Window.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="Colors.xaml" />
        <ResourceDictionary Source="Fonts.xaml" />
        <ResourceDictionary Source="Sizes.xaml" />
    </ResourceDictionary.MergedDictionaries>

    <Style x:Key="WindowStyle" TargetType="{x:Type Window}">
        <Setter Property="FontFamily" Value="{DynamicResource DefaultFontFamily}" />
        <Setter Property="FontSize" Value="{DynamicResource DefaultFontSize}" />
        <Setter Property="Foreground" Value="{DynamicResource DefaultForeground}" />
        <Setter Property="Background" Value="{DynamicResource DefaultBackground}" />
    </Style>
</ResourceDictionary>