title: VS2010 "An item with the same key has already been added"
body: <p>I recently installed Visual Studio 2010 and copied and converted an old VS2005 solution to VS2010</p>
  <p>When I edit this solution, if I try to change a control's .image property, VS2010 creates a message box telling me that &quot;An item with the same key has already been added&quot;, and won't let me browse for an image.</p>
  <p>I can add images for any other solution, even others ported from VS2005, but not this one. Any idea what I'm doing wrong?</p>