title: MFMailComposeViewController - UI issue in groups list while adding recipients
body: <p>In <code>MFMailComposeViewController</code> when I touch the <code>addRecipients</code> button, the contacts list opens and when I select the groups button, 
  the groups gets listed with transparent background. This looks clumsy as the groups table overlapping with the contacts list. 
  I face this issue in iOS7. This happens with some projects which are created in <code>xcode 4.2</code>.</p>