Consistent Look and Feel on XP with "Adv" controls


I am having a problem getting a consistent "flat" border look for two controls; TAdvDateTimePicker and TAdvComboBox.  ON Win7 it's not too bad, but on WinXP I get only get the effects shown in the image:

The TAdvDateTimePicker has a double border and the AdvComboBox is shown 3D.  I have CTL3D turned off on each one and all Bevel* properties to None.  Can you help please, it looks really messy.