WPF，material design控件换肤

<StackPanel VerticalAlignment="Center" HorizontalAlignment="Right" Margin="48,0,12,0" Background="#FFFFFF" Name="SetBtnBG" >
<materialDesign:PopupBox StaysOpen="False" Foreground="#111111" Name="SetBtnFG" >
<StackPanel Background="#FF0000" Margin="0,0,0,-10">
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" Margin="10" >
<TextBlock Text="明" Margin="0 0 10 0"/>
<ToggleButton x:Name="DarkModeToggleButton" IsChecked="{Binding IsDark}" Command="{Binding ChangeTheamCommand}"/>
<TextBlock Text="暗" Margin="10 0 0 0"/>
</StackPanel>