title: Using NSTimer to call SetNeedsDisplay in Xamarin for iOS
body: <p>I have a UIView that takes data (thats changing) from a buffer and plots it.  I want the screen udpated at 10Hz.  The UIView is called pane, and this is how i'm invoking it inside the ViewController: </p>
  
  <pre><code>        //create graphics to display data
          GraphPane pane = new GraphPane ();
          pane.Frame = UIScreen.MainScreen.Bounds;
          Add (pane); 
  
          //setup timer to update pane
          NSTimer timer = NSTimer.CreateRepeatingTimer (0.1, delegate {pane.SetNeedsDisplay ();});
  </code></pre>
  
  <p>This isn't working (Pane.Draw is never called), and I've not found a good example of how to do this.  Any suggestions are appreciated.</p>