How to ensure that the popUp always displays above the PopUpButton? With test case and screenshot
问题 Few users of my Flex 4.6 web application are complaining, that the mx.controls.PopUpButton at the right bottom corner of it sometimes opens a List underneath it and is thus unusable (I can't reproduce that myself - probably an unlucky combination of their Flash player and/or font size setting?) How could I ensure, that the popUp component (in my case it is a spark.components.List) always opens above the PopUpButton? I suspect, that I should create a skin based on mx.skins.halo.PopUpButtonSkin