title: Controls suddenly disappeared on form designer
body: <p>I just added a new item to a toolstrip menu in my main form and all of a sudden all of my controls located on this form disappeared!</p>
  
  <p>It's really strange as I didn't get any error or anything similar, I can also run the application normally but the controls are missing on my main form only.</p>
  
  <p>I tried cleaning/rebuilding my solution and restarting Visual Studio 2012 but nothing seems to work.</p>
  
  <p>This is what my main form looks like now:
  <a href="https://i.stack.imgur.com/qlKO8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qlKO8.png" alt="My Main Form"></a></p>
  
  <p>Does anyone have any idea of what's going on?
  Thanks in advance!</p>