title: AS3: TextField seems to have an invisible background fill?
body: <p>Let's get started.</p>
  
  <p>I create a Sprite 'father', add another Sprite 'child' as it child, and draw a filled rectangle with the graphics property of the 'child' Sprite. Then, I add another TextField instance as a child of the 'father' Sprite, and set its text to, say, "Payphone", in such a way that the text is displayed on the filled rectangle.</p>
  
  <p>At last I add an event listener, listening to MouseEvent.MOUSE_OVER, that traces "HIT!", when I move the mouse on the edges of the filled rectangle, it traces "HIT!"; but when I move the mouse around the center of the filled rectangle it doesn't trace anything. And mentioning that my mouse was in the bounding box of the TextField, does TextField have an invisible background fill? Is it able to be removed? How?</p>
  
  <p>Thanks! :)</p>