Where to initialize child controls on TCustomControl - c++

Question

I'm trying to create a simple custom control using Borland C++ Builder 6. In this case, I am trying to create a TPageControl with a single TTabSheet on it. I am having trouble figuring out the proper place to initialize these child controls. At the moment I am initializing everything in the constructor. Everything compiles fine, but when I attempt to place the control onto a form, the Borland IDE gives me an error "Control '' has no parent window" or something very similar. I've found out that the line that is causing this specifically is the setting of the TTabSheet's PageControl property.
The code for my control is below:
//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include "TestControl.h"
#pragma package(smart_init)
//---------------------------------------------------------------------------
// ValidCtrCheck is used to assure that the components created do not have
// any pure virtual functions.
//
static inline void ValidCtrCheck(TTestControl *)
{
new TTestControl(NULL);
}
//---------------------------------------------------------------------------
__fastcall TTestControl::TTestControl(TComponent* Owner)
: TCustomControl(Owner)
{
pageControl = new TPageControl(this);
pageControl->Parent = this;
tabSheet = new TTabSheet(pageControl);
tabSheet->Parent = pageControl;
tabSheet->Caption = "Page 1";
tabSheet->PageControl = pageControl;
}
//---------------------------------------------------------------------------
__fastcall TTestControl::~TTestControl()
{
pageControl->Free();
}
//---------------------------------------------------------------------------
namespace Testcontrol
{
void __fastcall PACKAGE Register()
{
TComponentClass classes[1] = {__classid(TTestControl)};
RegisterComponents("Test", classes, 0);
}
}
//---------------------------------------------------------------------------
Any assistance would be much appreciated--I'm finding that due to the age of this particular technology I'm not having much luck finding resources on this.