pack://application:,,,/ResourceFile.xaml Never Works

Question

I have never been able to get this format of reference a Resource Dictionary to work. What am I missing.

Scenario:

Creating and assembly with some usercontrols i

Answer 1

Can't reproduce your problem. All these variations work fine:

Note that pack://application:,,, is optional and / refers to the root of the current assembly.

Please provide complete minimal example which reproduces your problem.