title: Corrupted ActiveX control? "Can't exit design mode because Control 'DTPicker1" can not be created"
body: <p>I am developing an Excel VBA application on my desktop machine. I have a DatePicker ActiveX control on my spreadsheet. It was working fine.  </p>
  
  <p>Then, while on travel, I was working on the application on a laptop.  When I returned, I moved the file back to my desktop machine. Now when I try to run the app, I continually get the error "Can't exit design mode because Control 'DTPicker1" can not be created".  </p>
  
  <p>Renaming the control and all its references in the code hasn't helped.  When I try to delete the control I still get the message even though there is no longer a control of that name.  </p>
  
  <p>How do I fix this?</p>