[[poliburro]]

Código Delphi [-]
procedure TForm1.StringGrid1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
 Var
  Valor :String;
  LGcCoord: TGridCoord; //Define las cordenadas del mouse en el grid
begin
  LGcCoord := TCustomGrid(StringGrid1).MouseCoord(x,y);
  GiCol := LGcCoord.X; //Establece la columna seleccionada
  GiRow := LGcCoord.Y; //Establece la fila seleccionada
  if (GiRow = 0) And (Button = mbleft) And (GiCol <> -1) then
    Begin
      with stringgrid1 do
        Begin
          GCelda := CellRect(GiCol,0);
          Valor := Cells[GiCol, 0];
          Canvas.Font := Font;
          Canvas.Brush.Color := clBtnFace;
          Canvas.FillRect(GCelda);
          Canvas.TextRect(GCelda, GCelda.Left + 2, GCelda.Top + 2, Valor);
          DrawEdge(Canvas.Handle, GCelda, 10, 2 or 4 or 8);
          DrawEdge(Canvas.Handle, GCelda, 2 or 4, 1);
        End;
     End;
End;
procedure TForm1.StringGrid1MouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
 Var
  Valor :String;
begin
  if (GiRow = 0) And (Button = mbleft) And (GiCol <> -1) then
    Begin
      with stringgrid1 do
        Begin
          Valor := Cells[Gicol, 0];
          Canvas.Font := Font;
          Canvas.Brush.Color := clBtnFace;
          Canvas.FillRect(GCelda);
          Canvas.TextRect(GCelda, GCelda.Left + 2, GCelda.Top + 2, Valor);
          DrawEdge(Canvas.Handle, GCelda, 4, 4 or 8);
          DrawEdge(Canvas.Handle, GCelda, 4, 1 or 2);
          GCelda := stringgrid1.CellRect(1, 1);
        End;
    End;
end;