No need for anything complicated. Add an expression that always has a value... try adding an expression that is simply 1 QlikView charts don't show you rows where all of the expressions are null. So, making sure that at least one expression always has a value will make sure all dimension rows are shown.
Thanks for this idea, Tim. In my sample QVW, I added the new expression per your suggestion and that does allow me to see the table with "A3" selected almost the way I want now but the "A2" selection is still only showing "Oranges" and the A3 selection now only shows "Prunes".
I am still hoping there's a way to have those show all of the Categories values, no matter which List is selected.
Thanks in advance for any additional ideas you might have. I'm still working on this here too.