ChineseChess/ChineseChess.GUI/App.xaml

<Application
    x:Class="ChineseChess.GUI.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    DispatcherUnhandledException="OnDispatcherUnhandledException"
    Exit="OnExit"
    Startup="OnStartup">

    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="/Styles/_FontSizes.xaml" />
                <ResourceDictionary Source="/Styles/_Thickness.xaml" />
                <ResourceDictionary Source="/Styles/MetroWindow.xaml" />
                <ResourceDictionary Source="/Styles/TextBlock.xaml" />
                <!--
                    MahApps.Metro resource dictionaries.
                    Learn more about using MahApps.Metro at https://mahapps.com/
                -->
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml" />
                <!--  Accent and AppTheme setting  -->
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Themes/Dark.Blue.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Themes/Light.Blue.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>