Hi Mr Adami
you were right,
at first the resources were defined as page. and during playing around to find the solution I changed them.
The problem was about not finding the assembly and it was easier than the way I thought I should go with Prism.
Now there are 2 cases to think/talk about, 1st is I think that could be a disability of the .Net that it can't find a referenced assembly !
Isn't it ?
the 2nd part which I wanted to say was that I prefer to make a utility class which could help doing this in code.
Thanks for the help