动态创建 listbox释放问题

procedure TForm5.FormCreate(Sender: TObject);
begin
//**********
  ListBox1:=TListBox.Create(self);
  ListBox1.Parent:=self;

  ListBox1.Left:=100;
  ListBox1.Top:=100;
  ListBox1.Width:=400;
  ListBox1.Height:=400;

  ListBox1.Style:=lbOwnerDrawVariable;
   ListBox1.ItemHeight:=100;
  ListBox1.AddItem('123',self);

end;

procedure TForm5.FormDestroy(Sender: TObject);
begin
//*************

//ListBox1.Style:=lbStandard;//
ListBox1.Free;
end;

出现Exception class EAccessViolation with message 'Access violation at address 7C93B1FA in module 'ntdll.dll'.问题？？

解决方案：

在free之前，还原风格，ListBox1.Style:=lbStandard;

OK!!!