How to create an MDI form in WPF.
You can use WPFMDI , which is exactly what you are looking for, and AvalonDock , which gives you other features.
Check out this MDI solution for WPF.NET 4 / 4.5 on Codeplex. You can display user controls as windows in a container, even different types of user controls.
MDIContainer
Try it, it worked for me
childwindow.Owner = this;
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