Kepler-Release/Venus/Venus_MainPages/Views/TopView.xaml

<UserControl x:Class="Venus_MainPages.Views.TopView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:Venus_MainPages.Views"
             xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
             xmlns:prism="http://prismlibrary.com/"
             prism:ViewModelLocator.AutoWireViewModel="True"
             mc:Ignorable="d" 
             d:DesignHeight="100" d:DesignWidth="800">
    <StackPanel Background="{DynamicResource BottomFrame_BG}" Orientation="Horizontal">
        <TextBlock Style="{StaticResource textBlockStyle}" Text="{Binding Title}" FontSize="60"   VerticalAlignment="Center" Margin="10,0,0,0" />
        <ToggleButton Style="{StaticResource ToggleButtonStyle1}" Margin="10,0,0,0">
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="Checked">
                    <i:InvokeCommandAction Command="{Binding SwichLanguageCommand}"/>
                </i:EventTrigger>
                <i:EventTrigger EventName="Unchecked">
                    <i:InvokeCommandAction Command="{Binding SwichLanguageCommand}"/>
                </i:EventTrigger>
            </i:Interaction.Triggers>
        </ToggleButton>
    </StackPanel>
</UserControl>