{
 There are two routines to implement the OnColumnClick Methods for a TStringGrid.
 Set the first row as fixed and the Defaultdrawing to True.
}

 type
  TForm1 = class(TForm)
  StringGrid1: TStringGrid;
  procedure StringGrid1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
  procedure StringGrid1MouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
  private
  zelle: TRect; // cell
  acol, arow: Integer;
  public
  end;
 var
  Form1: TForm1;
 implementation
 {$R *.DFM}
 procedure TForm1.StringGrid1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
 var
  Text: string;
 begin
  with stringgrid1 do
  begin
  MouseRoCell(x, y, acol, arow);
  if (arow = 0) and (button = mbleft) then
  case acol of
  0..2:
  begin
  // Draws a 3D Effect (Push)
  // Zeichnet 3D-Effekt (Push)
  zelle := CellRect(acol, arow);
  Text := Cells[acol, arow];
  Canvas.Font := Font;
  Canvas.Brush.Color := clBtnFace;
  Canvas.FillRect(zelle);
  Canvas.TextRect(zelle, zelle.Left + 2, zelle. + 2, Text);
  DrawEdge(Canvas.Handle, zelle, 10, 2 or 4 or 8);
  DrawEdge(Canvas.Handle, zelle, 2 or 4, 1);
  end;
  end;
  end;
 end;
 procedure TForm1.StringGrid1MouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
 var
  Text: string;
 begin
  with StringGrid1 do
  begin
  // Draws a 3D-Effect (Up)
  // Zeichnet 3D-Effekt (Up)
  Text := Cells[acol, arow];
  if arow = 0 then
  begin
  Canvas.Font := Font;
  Canvas.Brush.Color := clBtnFace;
  Canvas.FillRect(zelle);
  Canvas.TextRect(zelle, zelle.Left + 2, zelle. + 2, Text);
  DrawEdge(Canvas.Handle, zelle, 4, 4 or 8);
  DrawEdge(Canvas.Handle, zelle, 4, 1 or 2);
  MouseToCell(zelle.Left, zelle., acol, arow);
  end;
  end;
  if (arow = 0) and (Button = mbleft) then
  case acol of
  0..2:
  begin
  // Code to be executed...
  // Programmcode der ausgefuhrt werden soll
  ShowMessage('Column ' + IntToStr(acol));
  zelle := stringgrid1.CellRect(1, 1);
  end;
  end;
 end;
 end.