title: Applying VisualStateManager to both ControlTemplate and Content
body: <p>I have restyled a Button using a ControlTemplate in a Style, which contains a VisualStateManager MouseOver state that inverts the Background to Black and the Foreground to White.</p>
  
  <p>I then use this styled button to host a Path object with its Fill property set to Black.</p>
  
  <p>How do I make the Fill property of the Path object, contained within the Content of the Button change to White when the MouseOver state is triggered without having to move the Path into the ControlTemplate itself which means creating a seperate Style for each button?</p>