title: Override a visualstate in a style without overriding the controltemplate
body: <p>I'm trying to tweak an existing (rather complex) control just a little bit. So far I can make the changes all in the style, apart from some tweaks to the animations.
  I know I can override the controltemplate in the style and change the VisualStateManager stuff there, but I really don't want to touch it's template. Does anyone know of a way to change a VisualState through a Style without having to duplicate the full ControlTemplate? 
  (Or does anyone know for sure it can't be done?)</p>