title: Flex PopUpManager: How can I detect the existence of a modal popup?
body: <p>My Flex 3 application has some modal dialogs displayed via the PopUpManager, but there are times when I'd like other view components to know there is popup displayed. The PopUpManager doesn't have any method for actually checking the existence of popups. Is there any other way to detect this in flash/flex without writing my own global manager?</p>
  
  <p>(also systemManager.popUpChildren.numChildren == 0 even when there's a modal popup)</p>
  
  <p>Cheers.</p>