 import spark.core.DisplayObjectSharingMode;
 import spark.core.IGraphicElement;
 import spark.core.MaskType;
+import spark.primitives.shaders.ColorBurnShader;
+import spark.primitives.shaders.ColorDodgeShader;
+import spark.primitives.shaders.ColorShader;
+import spark.primitives.shaders.ExclusionShader;
+import spark.primitives.shaders.HueShader;
+import spark.primitives.shaders.LuminosityShader;
+import spark.primitives.shaders.SaturationShader;
+import spark.primitives.shaders.SoftLightShader;
+import spark.primitives.shaders.LuminosityMaskShader; 
 
 use namespace mx_internal;
 

import flash.display.BlendMode;
import flash.display.DisplayObject;
import flash.display.DisplayObjectContainer;
import flash.display.Shape;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.EventDispatcher;
import flash.events.IEventDispatcher;
import flash.geom.ColorTransform;
import flash.geom.Matrix;
import flash.geom.Matrix3D;

     */
    public function set maskType(value:String):void
    {
        if (_maskType == value)
            return;

        _maskType = value;
        maskTypeChanged = true;
        invalidateProperties();
    }
