WPF 使用用户控件UserControl来切换界面（二）

在上一篇文章中https://www.cnblogs.com/lizhiqiang0204/p/12367553.html我们使用按键Button来切换界面的，这次我们使用自定义的ItemsControl数据模板来切换页面。MainWindow.xaml如下

<Window.DataContext>
        <local:MainWindowVeiwModel></local:MainWindowVeiwModel>
    </Window.DataContext>
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="200"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Border Grid.Column ="0"  BorderThickness="3" BorderBrush="Gray" >
            <ScrollViewer Grid.Row="2">
                <ItemsControl ItemsSource="{Binding Items}">
                    <ItemsControl.ItemTemplate>
                        <DataTemplate>
                            <Grid Style="{StaticResource MenuItemGrid}"> 
                                <Border MouseDown="UIElement_OnMouseDown" Style="{StaticResource MenuItem}"   Background="{Binding BackColor}"   >
                                    <TextBlock Grid.Row="0" Grid.Column="1" Style="{StaticResource H5}"  Text="{Binding Title}"/>
                                </Border>
                            </Grid>
                        </DataTemplate>
                    </ItemsControl.ItemTemplate>
                </ItemsControl>
            </ScrollViewer>
        </Border>

        <Border Grid.Column ="1" BorderBrush="Gray" BorderThickness="3" >
            <ContentPresenter  Content="{Binding Content}"/>
            <!--使用内容呈现器来显示用户控件界面-->
        </Border>
    </Grid>

MainWindow.xaml