title: wpf click button in usercontrol calls event in parent window
body: <p>This must have been asked before, but I am fairly new and don't quite know how to express myself...</p>
  
  <p>1) I have a UserControl that basically acts as a toolbar. I re-use the toolbar in each window, hence the need for a uc.
  2) The toolbar is filled with buttons
  3) the usercontrol doesn't act on the button (no code), but it should pass the event back to the parent window so the code in the parent window fires up.</p>
  
  <p>How can I do this? Is this a routed event? any sample code in vb.net would be appreciated!</p>