class GridDummy extends MovieClip{
	var _upper:GridDummy;
	
	function GridDummy(){
		this.onMouseMove = defaultMouseMove;
	}
	function set upper(grid:GridDummy){
		
		if(grid == undefined ||grid == null){
			this.onMouseMove = defaultMouseMove;
		}else{
			this.onMouseMove = extMouseMove;
		}
		_upper = grid;

	}
	function get over():MovieClip{
		return _upper;
	}
	
	function checkMouse():Boolean{
		return this.hitTest(_root._xmouse,_root._ymouse,true);
	}
	
	function defaultMouseMove(){
		if(checkMouse()){
			trace('onMouseMove ' + this);
		}
	}
	
	function extMouseMove(){
		if(checkMouse() && !_upper.checkMouse()){
			trace('addMouseMove ' + this);
		}
	}
}
//belowGridDummyMC.upper = upperGridDummyMC;