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Following your sample project Contacts_MVVM, I have tried to reproduce the way you created and used dialog boxes. After the result closes and it runs into the OnWindowClosed event there is an Application_UnhandledException that says "System.InvalidOperationException: Reference is not a valid visual DependencyObject."
Any idea what could be causing this?
I tried to reproduce the problem in my local tests by creating a simple page with UXButton to show dialog box but my efforts were not successful -- everything worked smoothly and the dialog box was accessed without any issues.
I’m willing to advise you further but in order to do so I would need you to elaborate on your specific scenario and possibly give me a step-by-step guide that I can use to observe the problematic behavior.
I enclose the xaml page and the view model class of my sample page as attachment. Should you find anything that I miss during my attempt to replicate the issue, please kindly let me know.
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