title: Blue mouse over effect on button in Blend / WPF
body: <p>I just started getting used to WPF using Blend for Visual Studio. I created previous programs with the standart Windows Forms and now want to get to something more modern.
  But I already encountered a main problem after like 5 Minutes.
  I added a button with an background image with a transperancy. That worked like a charm, but the problem is that, when I run the application, the button always gets blue when the Mouse hovers it. I do not want this blue effect but can't find the option to disable it in Blend. 
  Hope someone can help me with this stupid question, Windows Forms was a little </p>