I am trying to make new style for RadButton that matches how we are styling our SL4 Buttons. I am seeing a light-colored inner border on the button that I suspect may be using ControlInnerBorder_Normal (see attached image). I do not see a brush with that name or any reference to that name in the XAML that is generated when I copy the style from RadButton in Blend. How do I edit the ControlInnerBorder_Normal brush?