AdvDbComboBox borders when form.ctrl3d=false

Hi,
I have border drawing problem with AdvDbComboBox and
AdvDbLookupComboBox.
1) Create new empty form
2) change form.Ctrl3d=false
3) place advedit to that form. Nice single borders. (Just for reference, what it should look like)
4) place TAdvDbComboBox. It still has borders, but they are Ctrl3d look.
5) Change flat=true. There is only border at bottom of control

Mika