import mx.effects.EffectTargetFilter;
import flash.events.Event;
public function filterFunc(propChanges:Array,instanceTarget:Object):Boolean {
return false;
}
private var myBlurFilter:EffectTargetFilter;
private function initFilter(event:Event):void {
myBlurFilter = new EffectTargetFilter();
myBlurFilter.filterFunction=filterFunc;
myBlur.customFilter=myBlurFilter;
myUnBlur.customFilter=myBlurFilter;
}