Launches the Popup List, waits for an item to be selected and then closes the PopupList.
*
@param rect the initial size and location of the PopupList; the dialog will be
positioned so that it does not run off the screen and the largest number of items are visible
*
@return the text of the selected item or null if no item is selected
Launches the Popup List, waits for an item to be selected and then closes the PopupList. * @param rect the initial size and location of the PopupList; the dialog will be positioned so that it does not run off the screen and the largest number of items are visible * @return the text of the selected item or null if no item is selected