Class: TEgDBGridEx
procedure DefaultDrawColumnCell(const ARect: TRect; DataCol: Integer; Column: TColumn;
AState: TGridDrawState);
Draws a single data cell using this component’s own rendering for
checkbox and graphic (image/BLOB) columns, falling back to the inherited
TDBGrid rendering for every other column type. Exposed
publicly so an OnDrawColumnCell handler assigned to the
grid can call it to fall back to TEgDBGridEx’s default
painting for cells it does not want to customize itself.