Image doesn't show at run time

I developed an assembly with images (build action = resource). This is refereced in my principal application. When I make a reference to any image it works fine in design time (Blend and VS 2008) and the image is showed, but don't when I run the application. When running the image simple don't show as it was not there.

I try to use:

<Image Source="/DIL;ImageStore/new.png"...

and

<Image Source="pack://application:,,,/DIL;component/ImageStore/new.png"...

The result is the same as described. What I'm missing here?