Want a Animation
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my project is based on Adobe air/actionscript Project and its a Small desktop application. i opened a popup using popupmanager Class. so here is code.

    var _dataviewPopup = new dataviewPopup();
    /*	PopUpManager.addPopUp(_dataviewPopup , FlexGlobals.topLevelApplication as DisplayObject, true);
    PopUpManager.centerPopUp(_dataviewPopup);
and i remove popup using 

    PopupManager.removePopUp(_dataviewPopup);

So i want to give some animation to this popup when it appear and disappear, is It possible?
is there any library available for it?

Thanks Friends!!