Создание своего класса наследника TOpenDialog - C++ Builder - Ответ 7616413

#ifndef formH
#define formH
//---------------------------------------------------------------------------
#include <System.Classes.hpp>
#include <Vcl.Controls.hpp>
#include <Vcl.StdCtrls.hpp>
#include <Vcl.Forms.hpp>
#pragma warn -aus
//---------------------------------------------------------------------------
class TForm3 : public TForm
{
__published:    // IDE-managed Components
    __fastcall TForm3(TComponent* Owner);
        class TMyOpenDialog : TOpenDialog
         {
            public:
                  using TOpenDialog::TOpenDialog;
                  TMyOpenDialog();
         };
};
//---------------------------------------------------------------------------
extern PACKAGE TForm3 *Form3;
//---------------------------------------------------------------------------
#endif

#include <vcl.h>
#pragma hdrstop
 
#include "form.h"
#include "opendlg.h"
//---------------------------------------------------------------------------
#pragma warn -aus
#pragma package(smart_init)
#pragma resource "*.dfm"
 
TForm3 *Form3;
//---------------------------------------------------------------------------
__fastcall TForm3::TForm3(TComponent* Owner)
    : TForm(Owner)
{
 
 
}