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Hello to everybody. I need to add a button to each cell and use one click function. Unfortunately I get an error Access violation at address ... Thank you all. Daniel public { Public declarations } procedure btnChangeSClick(Sender: TObject); ... ... procedure TfrmMain.btnChangeSkupinaClick(Sender: TObject); begin frmSelectS.gridName := 'TEST'; frmSelectS.ShowModal; end; procedure TfrmMain.grid1DrawColumnCell(Sender: TObject; const Rect: TRect; DataCol: Integer; Column: TColumn; State: TGridDrawState); var Field: TField; fixRect : TRect; btnChangeS: TButton; begin Field := Column.Field; if (Column.Index = 0) then begin try btnChangeS.Create(grid1); btnChangeS.Parent := grid1; btnChangeS.Visible := True; btnChangeS.Caption := '...'; btnChangeS.Width := 25; btnChangeS.Height := (Rect.Bottom - Rect.Top) - 2; btnChangeS.Left := (Rect.Left + Rect.Width) - (btnChangeS.Width +1); btnChangeS.Top := Rect.Top + 1; btnChangeS.OnClick := btnChangeSClick; grid1.DefaultDrawColumnCell(Rect, DataCol, Column, State); except On E: exception do begin ShowMessage(E.Message); end; end; end; end;