title: Bind event in custom WPF control to command in ViewModel
body: <p>I have a custom control that has an event. 
  I have a window using that custom control.
  The window is bound to a viewmodel.
  I would like to have the event from the custom control direct to an ICommand on my viewmodel.
  I am obviously being dense here as I can't figure out how to do this. Any assistance is most welcome.</p>
  
  <p>Thanks</p>