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What is the best practice to load an UserControl into an Window with MVVM-Light?
Where create the UserControl instance, in the ViewModel from Window or direct in the window?
Your VM should not contain any UI specific code like controls if you are worried about best practice. For example, if you have a property in the VM that controls the visibility of a control in your view, that property should be of type bool and not Visibility. The view will use the bool property to hide or show the control.
So you have a view (like a window) which databinds against a VM. Some property changes in the VM which will cause some code in the window to create and show a user control.