WPF UserControl cannot find XAML resource in referencing project

Question

In my WPF project i keep a user control in a separate library project. The user control accesses resources in a separate XAML file, like this:

Answer 1

I had the same situation, but the Pack URIs didn't help me, I was still getting "Cannot locate resource..." exception in the referencing (executable) project. What helped me, was the setting of my ResourceDictionary files in the custom control library project as Embedded Resource.