title: Capture a keyup event at application level in WPF
body: <p>Hi I have an application built in wpf.</p>
  
  <p>At the base level I have a usercontrol and on that usercontrol are many components.</p>
  
  <p>I want to be able to capture a key press event on my usercontrol even if the focus is on one of the children. Using PreviewKeyUp doesn't seem to do the trick.</p>
  
  <p>Thanks,
  Matt.</p>