TStringGrid를 상속받아 TGrid라는 클래스를 만들려고 하는데요

class TGrid : public TStringGrid
{
    public:
                 TGrid();
};

다음과 같은 에러가 납니다.
"Complier could not generate default constructor for class 'TGrid'"

왜 그런건가요?


//.h
//---------------------------------------------------------------------------

#ifndef Unit1H
#define Unit1H
//---------------------------------------------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include <ComCtrls.hpp>
#include <Grids.hpp>
//---------------------------------------------------------------------------

class TGrid : public TStringGrid
{
    public:
                 TGrid();
};



class TForm1 : public TForm
{
__published:    // IDE-managed Components
    TStringGrid *StringGrid1;

private:    // User declarations
public:        // User declarations
    __fastcall TForm1(TComponent* Owner);

    TGrid *myGrid;
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
#endif







//.cpp
#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma link "ntabed"
#pragma link "replist"
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
    myGrid = new TGrid;
}
//---------------------------------------------------------------------------