problem with a TDBCheckBox on a TDBCtrlGrid

When I paste a TDBCheckBox on a TDBCtrlGrid, it is only visible on the panel
which have the focus.
It is not replied on the panels which don't have the focus.
When the focus is moved, it's like if the TDBCheckBox follows the focus .

Is it a bug from Delphi ?
How can I resolve that ?

Thanx

\\'ulfaz