title: Catching Keycombination on all windows in WPF without adding event on every window
body: <p>I want to add a KeyPress event on Application level which checks certain key combination whenever it is pressed.</p>
  
  <p>If keycombination is matched. I want to open a window on the current window that is executing.</p>
  
  <p>How can I do this.</p>
  
  <p><strong>Edit</strong></p>
  
  <p>I want to add KeyPress event on Application class so that it can capture key pressed on all the windows. 
  One way to do is, I can go to every Window and add event on each window.
  But what if number of windows is large enough. this is what my scenario is.</p>
  
  <p>So I was trying to do something on Application class to do the same work.</p>
  
  <p>How can I do</p>