The TabControl has an Event "OnDrawTab" that gives you the tab index and Rectangle
need to custom draw the tab..
You'll need to experiment of course but it gives you the chance to draw a custom
looking tab, text color ect
EDIT:
Just looking at the Windows target, it seems the OwnerDraw options does not
work? Hmm...
There Is the CusttomDrawn package that has a tabcontrol that does, you need to install it, its in the list of packages that are not yet installed.