title: Semi-transparency in ActionScript 3.0 shapes?
body: <p>I'm trying to make a modal pop up in my Flash application, not unlike the ASP.NET version <a href="http://www.asp.net/ajax/ajaxcontroltoolkit/samples/modalpopup/modalpopup.aspx" rel="nofollow">seen here</a>.</p>
  
  <p>I've already got the dialog box made, but I'm trying to add a semi-transparent gray rectangle over everything behind the pop-up, again like the one used in ASP.NET.  Is there a way to do this in ActionScript? It needs to be semi-transparent, not fully, so you can still partially see what's behind it.  I'm assuming you could apply this property to a Shape class somehow, but I can't figure it out.</p>
  
  <p>Thanks in advance for the help.</p>