title: got error The variable <variable name> is either undeclared or was never assigned
body: <p>I implement a big form in winforms C# with Visual Studio 2008.
  after working fine for a big portion of the dialog it start showing a lot of error masseges as in the title when I try to open the designer.</p>
  
  <blockquote>
    <p>"The variable  is either undeclared or was never assigned"</p>
  </blockquote>
  
  <p>I got this for a lot of controls that worked fine before.
  I think it happens with custom control that I use</p>