Mark,

I've found what may be the answer.  If I could put in here a screen shot of what I see i VS 2010 Errors / Code windows, that would be great but the content is apparently blocked.  Nor can I attach a file with the screen shot.

I'm getting more of these errors which while they exist, a new module I'm working on still builds and runs.  There are errors in C# code behind referring to controls that do in fact exist in the HTML markup.  This is from Extensions module code taken from the Extensions module of DNN since it has DNN 7.x tabs working.

The same errors, such as "installExtensionsControl does not exist in the current context", which shows up as an error in that module -- these appear as red underliines in the C# code.  Well, the module runs.

Seeing the same errors in the live module, I just blew off the fact that they were showing up in the code I copied and modified.  The module of course renders and works.

If you can take screen shots at a certain email, I'll show you what I mean.  There has to be a logical explanation for why the errors are showing at all.