MasterVB.NET

Hello, I have the following problem with Visual C++ 2005. I have a custom class derived from CDialog. I want to add a message handler for the WM_CLOSE message. In the "Class View" I select the class, then I go to the properties window and select "Messages", then I select WM_CLOSE and click on "<Add> OnClose", and I get an error message that says
"Add/Remove operation is impossible, because the code element
'ClassName' is read-only". Both my header and source files are read/write. Thanks in advance for any suggestions.

I read in an other thread that for there cases the problem was fixed by uninstalling the Internet Explorer 7 (beta?).
In my case I have the problem and no IE7 installed, so perhaps my problem may be Windows XP x64. I Still didn't found a solution to fix it for me. :-(

Hope you have IE7 installed! ;-)

Greetings
Maik