title: How to pass data from user control to main control in wpf
body: <p>I have status bar control in the main winodw. I have a user control placed in the main window.My user conrtorl has buttons .</p>
  
  <p>say if i click the button in the user control ,I need to update the main window status bar .</p>
  
  <p>I am following MVVM pattern. I am not sure how to achive this. I am beginner in wpf.</p>