title: WPToolkit control are not showing in the ToolBox
body: <p>I am developing a Windows Phone 8.0 App in VS2012</p>
  
  <p>And i installed the <strong>WPToolkit Package</strong> in the <strong>NuGet</strong> Manager </p>
  
  <p>the package <strong>installed successfully</strong> and It was added to the <strong>References</strong> </p>
  
  <p>But the controls of the package are not Showing in the ToolBox </p>
  
  <p>And i also checked the <strong>Object Browser</strong> , All the controls were found and included by the project</p>
  
  <p>but in the ToolBox they don't appear (Checked the ToolBox items too , don't appear)</p>
  
  <p>What is the problem ?</p>