title: Flex - Disabling the transparent background overlay on a popup
body: <p>I have a button in my flex app that creates a popup overtop of everything. However, it seems like flex automatically puts this transparent overlay overtop of the stage when this happens. How do I disable this? I have tried contentBackgroundAlpha="0" and backgroundAlpha="0" with no luck. </p>
  
  <p>anyone know what the proper syntax is for disabling this transparency? I have been searching through the docs for a 30 minutes now looking for it.</p>