title: Components added to TcxTabSheet are not displayed at runtime when TcxPageControl is hosted in a TFrame
body: <p>I am building a re-usable <code>TFrame</code> which contains a <code>TcxPageControl</code>. The idea is the frame is dropped onto the form and then I can add pages specific to that form.</p>
  
  <p>This works fine, I can successfully add pages through the designer and at runtime those tab pages appear. However, the problem is any components that are dropped onto the <code>TcxTabSheet</code> don't.</p>
  
  <p>If I add a page on the Frame itself (i.e. the base Frame, not the one dropped onto the form) and drop components on that, those show. However, if I drop components onto that same page from the form they don't.</p>
  
  <p>I am clearly missing something here but I would have thought the page control would just work as it would on any form (regardless if it's being surfaced from a <code>TFrame</code>) but clearly there seems to be <em>something</em> it doesn't like.</p>
  
  <p>Is this a bug or am I just not doing it right?</p>
  
  <p><em>Note - I am using the "Add to Palette" option to add the Frame as a component as I want to surface the <code>TPageControl</code> properties (incase that matters)</em></p>