App.xaml

<Application x:Class="Farplane.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:Farplane"
             xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
             xmlns:actions="clr-namespace:MahApps.Metro.Actions;assembly=MahApps.Metro"
             xmlns:controls="http://metro.mahapps.com/winfx/xaml/controls"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <!-- MahApps.Metro resource dictionaries. Make sure that all file names are Case Sensitive! -->
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Colors.xaml" />
                <!-- Accent and AppTheme setting -->
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/Blue.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/BaseLight.xaml" />
            </ResourceDictionary.MergedDictionaries>
            <DataTemplate x:Key="DonateFlyoutHeader">
                <StackPanel Orientation="Horizontal" Margin="10" >
                    <Button x:Name="nav" Foreground="White" Style="{DynamicResource MetroCircleButtonStyle}" Height="40" Width="40" FontFamily="Segoe UI Symbol" FontSize="16" VerticalAlignment="Top" Content="" >
                        <Button.Resources>
                            <SolidColorBrush x:Key="BlackBrush" Color="White" />
                        </Button.Resources>
                        <i:Interaction.Triggers>
                            <i:EventTrigger EventName="Click">
                                <actions:SetFlyoutOpenAction TargetObject="{Binding RelativeSource={RelativeSource AncestorType={x:Type controls:Flyout}}}" Value="False" />
                            </i:EventTrigger>
                        </i:Interaction.Triggers>
                    </Button>
                    <TextBlock Text="{Binding}" x:Name="PART_BackButton" FontSize="20" Margin="15,0,0,0" VerticalAlignment="Center"/>
                </StackPanel>
                <DataTemplate.Triggers>
                    <DataTrigger Binding="{Binding Position, RelativeSource={RelativeSource AncestorType={x:Type controls:Flyout}}}" Value="Right">
                        <Setter TargetName="nav" Property="Content" Value="" />
                    </DataTrigger>
                </DataTemplate.Triggers>
            </DataTemplate>
        </ResourceDictionary>
    </Application.Resources>
</Application>