title: How to get the Control for a Region in Prism
body: <p>Does anyone know how to get the control associated with a region in Prism.</p>
  
  <p>For example, if I have the following code to register a region</p>
  
  <p>RegionManager.SetRegionName(Outlook.navigationContainer, "navigationContainer");</p>
  
  <p>How can I get the control Outlook.navigationContainer via the name "navigationContainer"?</p>
  
  <p>Thanks heaps.</p>