How to get window handle to myPropertySheet derived from CPRopertySheet in myPropertySheet::OnOk()?

I have tried this..

Void myPropertySheet::OnOk()
{
    savePos(this->m_hWnd); //some savePos function
    ...
}

But somehow, this doesn't work.. I don't see any difference. I'm just wondering if this is giving handle to it's active property page?.