例5中刚说到视图精确控制，这次说明这样的灵活控制是怎样做的，显示或不显示，或切换视图。

主页上显示了主按钮和一个ContentControl

然后在后台代码中，对显示内容进行了精确控制

public partial class MainWindow : Window
{
IContainerExtension _container;
IRegionManager _regionManager;
IRegion _region;

    ViewA \_viewA;  
    ViewB \_viewB;

    public MainWindow(IContainerExtension container, IRegionManager regionManager)  
    {  
        InitializeComponent();  
        \_container = container;  
        \_regionManager = regionManager;

        this.Loaded += MainWindow\_Loaded;  
    }

    private void MainWindow\_Loaded(object sender, RoutedEventArgs e)  
    {  
        \_viewA = \_container.Resolve<ViewA>();  
        \_viewB = \_container.Resolve<ViewB>();

        \_region = \_regionManager.Regions\["ContentRegion"\];

        \_region.Add(\_viewA);  
        \_region.Add(\_viewB);  
    }

    private void Button\_Click(object sender, RoutedEventArgs e)  
    {  
        //activate view a  
        \_region.Activate(\_viewA);  
    }

    private void Button\_Click\_1(object sender, RoutedEventArgs e)  
    {  
        //deactivate view a  
        \_region.Deactivate(\_viewA);  
    }

    private void Button\_Click\_2(object sender, RoutedEventArgs e)  
    {  
        //activate view b  
        \_region.Activate(\_viewB);  
    }

    private void Button\_Click\_3(object sender, RoutedEventArgs e)  
    {  
        //deactivate view b  
        \_region.Deactivate(\_viewB);  
    }  
}

这里出现的新概念就是Activate 和DeActivate。控制显示和不显示。