BCB的实现方法：
//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
class TForm2 : public TForm1 {};
class TForm3 : public TForm1 {};
void __fastcall ShowForm(TMetaClass * FClass)
{
Application->CreateForm(FClass,&Form1);
Form1->ShowModal();
};
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button2Click(TObject *Sender)
{
ShowForm(__classid(TForm2));
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button3Click(TObject *Sender)
{
ShowForm(__classid(TForm3));
}
//---------------------------------------------------------------------------
