title: I upgraded a Visual Basic 6 project to Visual Basic 2008 project and got unknown errors
body: <p>I've recently upgraded my project to Visual Basic 2008 and I'm getting the following errors which I cannot identify, I hope someone can help:</p>
  
  <pre><code>AxThreed.AxSSCommand is not defined
  AxActiveInput.AxSSDropDownEdit is not defined
  AxPVTEXT3DLib.AxPVText3D is not defined
  </code></pre>
  
  <p>Any idea what this is and how to fix it?</p>