Thanks guys for your help. I finally recreated the development environment with VS2005 and MM 2.4.

Please notice that my web application has Infragistics subclassed controls.

Now regarding to this issue as I didn't have the subclasses for Infragistics 2007 Vol1 I installed my Infragistics 2007 Vol 2 with the subclasses for Vol 2.

Using Infragistics upgrade utility I upgarded my project to 2007 Vol 2. But here is the problem:

When I recompile the application I get a bunch of errors but the application compile and run. As soon as I call a page that has one of the Infragistics subclassed controls the application crash.

Here you have a typical error I get:

Unable to create type 'cc1:mmwebcombo'. Could not load file or assembly 'Infragistics2.WebUI.WebCombo.v7.1, Version=7.1.20071.40, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb' or one of its dependencies. The system cannot find the file specified.

I can see that my subclasses were not upgraded to the Vol 2.

So my question is: How can I make the upgrade on the subclassed Infragistics controls?

Thanks


P.S.: Thanks again to Tim for his support on this!!!