title: User Control not loading when container panel is invisible
body: <p>I have a usercontrol which has a combobox inside it.</p>
  
  <p>This UserControl is the inside an asp panel - and when the panel is visible, the dropdownlist within the control binds to its datasource and behaves itself.</p>
  
  <p>When the panel visibility is set to false, the dropdownlist within the usercontrol is empty.</p>
  
  <p>Any help appreciated.</p>
  
  <p>thanks.</p>