title: ActionScript game window coordinates set/get
body: <p>I want to write my first game on ActionScrpit 3. Now for my game I need a game window and I want to have a rectangle drawn in the game window so that its Y coordinate was 50px less than the window size is. My game window should extend Sprite. How can I do this. </p>
  
  <p>In other words my question is how to set and get game window coordinates?</p>