Tab button change based on a filter or field entry

Hi,

Im creating a message system in Knack for a customer - multi tab system, many users and although the message part is fine, I cant think of an easy way to tell a user there is a message to read/respond to … I was thinking maybe how to change the “Messages” tab button in the main header if there one to check, but not being a coder, Im ot sure how to, or if its even possible. I can do a hide view on pages but there would be a lot of pages to alter for that to work.

thanks in anticipation, Andrew (Scottish Borders, long time Knack)