> So - how to implement this? Completly override VCL's
> TCustomGrid or may be there is more simple way?

Override TIB_CustomGrid, most of the procedures you need to override
are virtual. For example override the DrawCell function and either...

* Take over drawing of the problem cells and leave the rest to a call
to inherited.

OR

* Draw all the cells yourself, using the code from the IBG_Custom.IMP
file (where TIB_CustomGrid.DrawCell is located) as a template,
altering what you require and do NOT call inherited.

HTH

Geoff Worboys
Telesis Computing