title: Dialog-element disapears behind media-element in IE
body: <p>Following issue: We are using the p:media tag to load a pdf document. Through user interaction  a separate dialog-window is opened. This works fine using Firefox or Chrome. Is using IE (confirmed in 9 &amp; 10) the pdf document remains in the foreground while the dialog is pushed into the background.</p>
  
  <p>We tried to fiddle around with z-index values with no success. Is there a solution that IE displays the dialog in front off the displayed pdf-file? I'm thankful for any help.</p>
  
  <p><img src="https://i.stack.imgur.com/mNn7r.png" alt="Cut off dialog element in IE 9 &amp; 10"></p>