ActiveX creationg isse

i got following example
// MyWnd.h
class CMyWnd : public CWnd
{
        DECLARE_DYNAMIC(CMyWnd)
public:
        CMyWnd();
        virtual ~CMyWnd();

        void Create();
        void CreateChildren();
        BOOL DestroyChildren();
protected:
        DECLARE_MESSAGE_MAP()
private:
        CMyActiveX m_oMyActiveX;
};

//MyWnd.cpp
IMPLEMENT_DYNAMIC(CMyWnd, CWnd)
CMyWnd::CMyWnd()
{
}
CMyWnd::~CMyWnd()
{
        DestroyWindow();
}
BEGIN_MESSAGE_MAP(CMyWnd, CWnd)
END_MESSAGE_MAP()
void CMyWnd::Create()
{
        // Create our window, which will catch page events
        CreateEx( 0, AfxRegisterWndClass( WS_OVERLAPPED ), _T(""), WS_OVERLAPPED, 0, 0, 0, 0, NULL, (HMENU) 0 );
}
void CMyWnd::CreateChildren()
{
        const int CTRL_ID = 1000;
        // Create a form control
       m_oMyActiveX.Create( NULL, WS_CHILD, CRect( 0, 0, 0, 0 ), this, CTRL_ID, NULL, FALSE, CComBSTR(L"AAAAAAAAAAA") );
}
BOOL CMyWnd::DestroyChildren()
{
        m_oMyActiveX.DestroyWindow();

        return TRUE;
}
// TEST 1
const int TEST_COUNT = 50000;
CMyWnd oMy;
oMy.Create();
for (int i = 0; i < TEST_COUNT; i++) {
        oMy.CreateChildren();
        oMy.DestroyChildren();
}
// TEST 2
const int TEST_COUNT = 50000;
for (int i = 0; i < TEST_COUNT; i++) {
        CMyWnd oMy;
        oMy.Create();
        oMy.CreateChildren();
}
// TEST 3
const int TEST_COUNT = 50000;
for (int i = 0; i < TEST_COUNT; i++) {
        CMyWnd oMy;
        oMy.Create();
        oMy.CreateChildren();
oMy.DestroyChildren();
}