>>>>>I found the class for this button, but I'm not sure what should I do.
>>
>>Once you have found the class, you need to look and see what it's namespace is and what Project it is in.
>>
>>Then go to the project you are trying to use it in and right click reference/add reference. Go to the projects tab and add that project.
>>
>>Then you need a using direct with the namespace you found in your class file.
>>
>>John
>>
>
>Hi John/Bonnie,
>
>I'll re-check on Monday, but I believe the class was inside the same project, just in the different folder. My colleague mentioned, though, the different project with classes, so may be the UCD folder inside this particular solution was the original version of these classes lately compiled into different project?
>
>Hard to say, I would need a thorough investigation, as it seems.

There is a good chance since it is in a different folder the namespace is appended with the folder name. You may have to reference it with the foldername. which would be the same as the namespace. Or change it's namespace to match the rest of your project.
Tim