This my first attempt at implementing the MVVM model so apologies in advance. I have a main window which has its own ViewModel. The Main Window then has three user controls which i which loads depending on what selected in the navigation menu. However the data context is not changing to the correct view model.This my first attempt at implementing the MVVM
阅读背景：
如何在主窗口中向用户控件添加多个ViewModel
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