How to query if a Sprite has had any shapes drawn in it?

programming flash
1

Consider the following:

   var mySprite:Sprite= new Sprite();
   addChild(mySprite);        
    trace(mySprite.graphics == null);
    //traces false        
    mySprite.graphics.beginFill(0x0000FF);
    mySprite.graphics.drawRect(0,0,100,100);
    mySprite.graphics.endFill();        
    trace(mySprite.graphics == null);
    //traces false        
    mySprite.graphics.clear();        
    trace(mySprite.graphics ==null);
    //traces false

the line of “mySprite.graphics==null” always proves false. So is there a way to determine if a Sprite has had something drawn (i.e. a line or a fill) in it.