[CS3] Dynamic transition (mask) not working??

[sstalder]

Try this:

var transPH1_mc:MovieClip = _root.attachMovie("trans1","transPH1_mc",1);
transPH1_mc.cacheAsBitmap = true;
clipPH1_mc.cacheAsBitmap = true;
clipPH1_mc.setMask(transPH1_mc);