I am using PopupManager in FB4 to display a custom dialog.

    popwin = new TitleWindow(); 
    popwin.addElement(myCustomDialog);
    PopUpManager.addPopUp(popwin,this,false);
    PopUpManager.centerPopUp(popwin);

It's possible to drag the popped up TitleWindow and let go of it when its gray title bar lies outside the bounds of the Flex app rectangle, and then the popup cannot be grabbed again. It's also possible to drag the TitleWindow downwards so it becomes completely invisible below the bottom edge of the Flex app rectangle. When the Flex app bounds are less than the full browser window, and the user is working quickly, this chances of this happening increase. Is there a simple setting that will keep this from happening, or must the programmer intercept the behavior during the drag operation?

Thanks Tim