flex4 弹出框正当中

flex4 弹出框居中?PopUpManager.addPopUp(waitDialog,? FlexGlobals.topLevelApplication.systemManager,

flex4 弹出框居中

?PopUpManager.addPopUp(waitDialog,? FlexGlobals.topLevelApplication.systemManager, true);
??PopUpManager.centerPopUp(waitDialog);

?

只能在flex4中使用。。。。