How can we set TableHeading and Table Row styles

We've created a Product_Table style. When a user inserts a new table using that style, we'd like the table header and table text to use our TableHeading and TableText styles, not the default styles. We have two writers who are very fluent in HTML and RoboHelp and neither have been able to find a way to accomplish this goal. The end result is that the users have to manually apply the TableHeader and TableText styles after inserting the table.

Thanks in advance for any help.

Carol