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

This can happen also when closing and reopening a window. So it could also have nothing to do with packages and/or dlls.
I solved the problem thanks to the solution posted by PainElemental, which is IMHO underrated:

namespace MyNamespace
{
  public partial class MyDialog : Window
  {
    public MyDialog(ExcelReference sheetReference)
      {
        this.LoadViewFromUri("/MyApp;component/mynamespace/mydialog.xaml");
      }
  }
}

LoadViewFromUri is implemented as an extension, as PainElemental wrote. The craziest is that I also wrote in the same project other windows without encountering any problem.
Thank you PainElemental, you ended my protracted pain!