title: How to bring window to front with wpf and using mvvm
body: <p>I have a window that essentially runs a timer.   When the timer hits 0 I want to bring the window to the front so that it is visible and not hidden behind some other application.</p>
  
  <p>From what I can gather I would simply call window.activate() to accomplish this but with mvvm my view model doesn't have a reference to window.</p>