ABCButtons и импровизированные окна GraphABC - PascalABC.NET

uses ABCButtons, GraphABC, ABCObjects;
var
  GN: string;
  w,h,btn1: integer;
  ifs: boolean;
  mm: Picture;
  NewGW: RectangleABC;

procedure init;
  begin
    GN:='Space Program';
    w:=640;
    h:=480;
    ifs:=true;
    SetWindowCaption (GN);
    SetWindowSize(w,h);
    CenterWindow;
    SetWindowIsFixedSize(ifs);
  end;

procedure NGWS;
  begin
    NewGW:=new RectangleABC(100,100,440,200);
    NewGW.Text:='ВНИМАНИЕ!';
    var BtnNext:= new ButtonABC(120,250,150,40,'Продолжить',clMoneyGreen);
    var BtnBack:= new ButtonABC(370,250,150,40,'Назад',clMoneyGreen);
  end;
  
procedure GameMenu; forward;
  
procedure NGW;
  begin
    Btn1:=1;
    GameMenu;
  end;
  
procedure GameMenu;
  begin
    mm:=Picture.Create(640,480);
    mm.Load('data/images/mm.bmp');
    mm.Draw(0,0);
    var BtnNewGame:= new ButtonABC(220, 200, 200, 50, 'Новая игра', clMoneyGreen);
    BtnNewGame.OnClick:=NGW;
    var BtnContinium:= new ButtonABC(220, 260, 200, 50, 'Продолжить', clMoneyGreen);
    var BtnSetting:= new ButtonABC(220, 320, 200, 50, 'Настройки', clMoneyGreen);
    var BtnExit:= new ButtonABC(220, 380, 200, 50, 'Выход', clMoneyGreen);
    if Btn1=1 then
      begin
        BtnNewGame.Visible:=false;
        BtnContinium.Visible:=false;
        BtnSetting.Visible:=false;
        BtnExit.Visible:=False;
        NGWS;
      end;
  end;

begin
  init;
  GameMenu
end.