确保您可以使用以下方法导航(显示)窗口:

sure you can navigate (show) a window by using:

YourFrame.Navigate(YourWindow);

YourFrame.Navigate(YourWindow);

但是我不太喜欢这种多窗口方法，***创建一些用户控件来分割您的应用程序.

However I don't like much this multi-window approach, better create some user controls for segmenting your application.