How Do You Programatically Select a Tab on The Ribbon?
 

I have a custom toolbar in an Excel 2003 application. Users that have
converted to 2007 are having difficulty discovering that they must
select the "Add-Ins" tab to find the custom toolbar. Therefore, I
would like to select that tab upon workbook open. I would also like to
disable or hide tabs. How can I do that programtically? I have
sucessfully added XML code using the Custom UI editor but do not know
the XML syntax, if any, available to control tab selection.

In addition to that question, does anyone have a link to a page that
is a reference for the XML syntax for the ribbon?

Thanks in advance!