Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

{ 
  Question: 
  How do I change the cell font color in a TDBgrid 
  I only want to change the individual cell that is clicked on! 
  (while in the edit mode) 

  Answer: 
  Since it is the InplaceEditor control that is displayed when the cell 
  is in edit mode you have to change this controls Color. Getting at it 
  is a bit ugly since the InplaceEditor property of TCustomGrid 
  (which TDBGrid inherits) is protected and the Color property of 
  TCustomMaskedit (from which TInplaceEditor inherits) is also protected. 
  The following works for a TStrinGrid. I used the grids OnGetEditMask event here 
  to have a place where the inplace editor is guaranteed to exist. 
  For a TDBGrid you could probably use OnColEnter. 
   
   
  Frage: 
  Wie дndere ich die Farbe der aktuellen Zelle eines Stringgrids oder TDBGrids ? 
   
  Antwort: 
  Der InplaceEditor wird angezeit, wenn eine Zelle im Editiermodus ist. 
  Es muss also dessen Farbe geдndert werden. Dies kann ьber eine "Cracker"-Klasse 
  erreicht werden. 
}

 type
   TForm1 = class(TForm)
     {...}
     procedure StringGrid1GetEditMask(Sender: TObject; ACol, ARow: Integer;
       var Value: string);
     procedure DBGrid1ColEnter(Sender: TObject);
   end;

 {...}

 uses
   Mask;

 type
   TGridCracker = class(TCustomGrid);
   TEditorCracker = class(TCustomMaskEdit);

 procedure TForm1.StringGrid1GetEditMask(Sender: TObject; ACol,
   ARow: Integer; var Value: String);
 var
   editor: TEditorCracker;
 begin
   editor := TEditorCracker(TGridCracker(Sender).InplaceEditor);
   if Assigned(editor) then
     editor.Color := clYellow;
 end;

 procedure TForm1.DBGrid1ColEnter(Sender: TObject);
 var
   editor: TEditorCracker;
 begin
   editor := TGridCracker(TGridCracker(Sender).InplaceEditor);
   if Assigned(editor) then
     editor.Color := clGreen;
 end;