title: Having my userControl have its own icon on the toolbox
body: <p>I made a control that inherits directly from ErrorProvider. I thought that applying it the ToolboxBitmap attribute would be enough to get my control to have the same icon on the toolbox as the original control has, but it doesn't. It's strange, as if I add the control to the form, it will appear just as it should, but it doesn't change the toolbox's icon. What am I missing here? I already restarted visual studio and it keeps this behavior.</p>
  
  <pre><code>[ToolboxBitmap(typeof(ErrorProvider))]
  public class ErrorProviderEx : ErrorProvider {
  ...
  }
  </code></pre>