[No Solution Found]Custom Progress Bar Max/Value problem

[darbid]

I have made a custom template for a progress bar.

Attached is a window XAML which you could simply add to a new project and see the problem.

The problem is that the Value does not work with the Max value. The Value must go to the width of the progress bar. ie if the width is 300 and the max is 100 then the value at 100 will only a third full. How can i correct this to the default way progress bars work.

Thanks guys in advice for any help. I am learning this stuff.