Банальные вопросы начинающего

 //---------------------------------------------------------------------------
 #include <vcl.h>
 #pragma hdrstop
 #include "ViewMain.h"
 #include "MDIChild.h"
 //---------------------------------------------------------------------------
 #pragma package(smart_init)
 #pragma resource "*.dfm"
 TMainForm *MainForm;
 //---------------------------------------------------------------------------
 __fastcall TMainForm::TMainForm(TComponent* Owner)
 : TForm(Owner)
 {
 }
 //---------------------------------------------------------------------------
 void __fastcall TMainForm::Open1Click(TObject *Sender)
 {
 if (OpenDialog->Execute())
 {
 TChild* child = new TChild(this);
 child->SetParent(this); // <--------- ошибка
 child->Image->Picture->LoadFromFile(OpenDialog->FileName);
 child->ClientWidth = child->Image->Picture->Width;
 child->ClientHeight = child->Image->Picture->Height;
 child->Caption = OpenDialog->FileName;
 child->Show();
 }
 }

__property TWinControl* Parent = {read=FParent, write=SetParent};

TChild* child = new TChild(this);
 child->Parent = this;