title: Winforms Designer: How to disable my usercontrol from being a container?
body: <p>I have a relatively simple setup.  I have a custom usercontrol that has a bunch of components on it, some text boxes, and a listview.</p>
  
  <p>In the designer, I can drag and drop other controls into my usercontrol, and it adds them to the usercontrol instance.  I don't want this.</p>
  
  <p>How can I explicitly say "Don't allow additional controls to be added to this usercontrol?"</p>
  
  <p><img src="https://i.stack.imgur.com/QZ4jO.jpg" alt="Reproduction"></p>