Problem with localToGlobal

programming flash
1 

        public function YBranch(controller:YTree, v:int, thick:Number, len:Number, rot:Number):void
        {
            
            _theBoss = controller;
            _lvl = v;
            
            this.rotation=rot;
            
            if (_lvl>=_theBoss.maxlevel) {
                // Add leaf node and exit
                var pt:Point=this.localToGlobal( new Point(0,0) );
                trace(pt.y);
                _theBoss.addLeafNode( new YNode(pt.x, pt.y, rot));
                return;
            }

Note: YNode is simply a class that extends Point but it has an additional rotation property. Every YBranch does not scale itself. It only rotates itself and draws an appropate length.

I’m creating a fractal tree and at the end of the recursion, it adds leaf nodes to the _TheBoss Tree which draws the leaves into bitmapData.
But why does the traced pt.y and .x return zero (ie. (0,0) point???