 import spark.core.MaskType;
 import spark.layouts.BasicLayout;
 import spark.layouts.supportClasses.LayoutBase;
+import spark.primitives.shaders.LuminosityMaskShader; 
 
 use namespace mx_internal;
 

                    _mask.cacheAsBitmap = true;
                    cacheAsBitmap = true;
                }
            }
        }       


import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.filters.ShaderFilter; 
import flash.geom.Rectangle;

import mx.core.IVisualElement;
