title: Adding a user control using Windows Form designer
body: <p>This is probably an incredibly obvious question, but I just can't figure it out.</p>
  
  <p>I have a Windows Form managed by the form designer. I'd like to include a custom user control, also managed by the form designer. But I'm unable to get the custom control to show up in the Toolbox, even if I try manually adding it under the "Choose Items..." dialog.</p>
  
  <p>Both form and control are in the same assembly. I've tried separating the control into a separate assembly in order to follow the instructions <a href="http://msdn.microsoft.com/en-us/library/ms235628.aspx" rel="noreferrer">here</a> to the letter, to no avail. I'm also using C++/CLI, if that changes anything.</p>
  
  <p>Is there an attribute or such I should be setting to my control in order for it to appear in the Designer Toolbox?</p>