Web - Table - Field updates

I have a table on the web that has a few fields on it. Tabbing is working fine by the user of HotSpots and the HideRefresh of the table to go from tab to tab. It works very well…

But…

I have two fields in Tab 1. Based on the values they enter, I want another field to be updated when the users go to another tab. The field is a ‘Select Option’(DialogList) - I thought putting code into the Tab graphic would update the ‘Select Option’ - but it does not!

Due to the complex equation, JS is not really an option.

How can I do this? Any suggestions?