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I am building a tooltip class that upon rollover of a displayobject, I will highlight the object with a tweened glow. When you roll off, the glow will go away. But, if the objects already has its own glow applied, I don't want to interfere with it during removal of my new tooltip highlight glow. I see there is a param for addFilter:boolean, that I think will allow me to add my new glow filter to an object that already has it's own glow filter. And there is a remove:boolean that will auto cleanup that filter at the end of the tween. but what if I want to keep the new highlight-glow attached until a later time, such as rollout? I think what I am trying to do is store the new glowFilter in a variable, so I can later remove that specific glow filter by reference. But I don't see how I can do this within the Tween engine. It looks like almost all the tools are there for me, but not quite. What am I missing? To reiterate, I don't mind if an object has two glow filters applied; one from before, and one from my rollover. But I want to leave the original glow intact, if it had one.