The component does not have a resource identified by the uri

Question

I want to create a Generic DataGrid to use on all my Views/UserControls.

This is my structure:

Class Library called \"Core\":

Answer 1

I just ran into this problem as well without any inheritance issues. I was just referencing a DLL that contained a dialog and trying to create and display that dialog. I have assembly resolver that loads assemblies from a specific folder and it turns out that I had added the reference in VS and had not turned off Copy Local. Long story short: my process had loaded two versions of that same DLL. This seems to confuse WPF (or the runtime). Once I cleared the Copy Local and deleted the extra DLL copies, it worked fine again.