Tab order problems

[me1258]

I have a form with 6 combo boxes at the top.
Then I have 3 sub forms with 2 or 3 columns each
I have the tab order set up so it cycles through the top 6 combo boxes adn that works just fine. But when I go to tab into the sub forms the tab order is never consistant. I set the tab order of the sub forms but when I jump from the combos to the subform the order is unpredictable.

What gives

THanks