Cambio del valor S N en un RadioButton

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Código Delphi [-]
unit Unit1;

interface

uses
  Winapi.Windows,
  Winapi.Messages,
  System.SysUtils,
  System.Variants,
  System.Classes,
  Vcl.Graphics,
  Vcl.Controls,
  Vcl.Forms,
  Vcl.Dialogs,
  FireDAC.Stan.Intf,
  FireDAC.Stan.Option,
  FireDAC.Stan.Param,
  FireDAC.Stan.Error,
  FireDAC.DatS,
  FireDAC.Phys.Intf,
  FireDAC.DApt.Intf,
  Data.DB,
  Vcl.StdCtrls,
  Vcl.DBCtrls,
  Vcl.Grids,
  Vcl.DBGrids,
  FireDAC.Comp.DataSet,
  FireDAC.Comp.Client,
  Vcl.ExtCtrls,
  Vcl.Buttons,
  Vcl.Menus;

type
  TForm1 = class( TForm )
    FDMemTable1: TFDMemTable;
    DBGrid1: TDBGrid;
    FDMemTable1MyDBCheckField: TBooleanField;
    DBCheckBox1: TDBCheckBox;
    DataSource1: TDataSource;
    DBNavigator1: TDBNavigator;
    PopupMenu1: TPopupMenu;
    SI1: TMenuItem;
    No1: TMenuItem;
    procedure DBCheckBox1Click( Sender: TObject );
    procedure SI1Click( Sender: TObject );
    procedure No1Click( Sender: TObject );
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

var
  LChecked: boolean;

procedure TForm1.DBCheckBox1Click( Sender: TObject );
begin
  LChecked := DBCheckBox1.Checked;
  //
  PopupMenu1.Popup( Mouse.CursorPos.x, Mouse.CursorPos.Y );
end;

procedure TForm1.No1Click( Sender: TObject );
begin
  DBCheckBox1.Checked := LChecked;
  DBGrid1.DataSource.DataSet.Cancel;
end;

procedure TForm1.SI1Click( Sender: TObject );
begin
  if ( DBGrid1.DataSource.DataSet.State in [ dsEdit, dsInsert ] ) then
    DBGrid1.DataSource.DataSet.Post;
end;

end.