How to add a Watch Window while debugging

I have an SSIS Package that works intermittently.  In my For each loop container, some of the SPs run, others do not.  I would like to Watch my variables during debugging.  I have set a Breakpoint on the For each loop container.  As you can see below, the package is stopped at the Breakpoint.  Now, I would like to "Watch" my variables.  I can right-click the container and see an "Add Watch" command, but clicking this produces no results.  Can anyone suggest what I am missing/doing wrong or propose an alternative debugging solution?

Thanks.

Mario