I need help debugging an MFC OCX

I am having problems with the following piece of code.

void CFlintCtrl::DoPropExchange(CPropExchange* pPX)
{
ExchangeVersion(pPX, MAKELONG(_wVerMinor, _wVerMajor));
COleControl::DoPropExchange(pPX);

PX_Bool(pPX, _T("ReadAhead"), m_bReadAhead, FALSE);
}


This routine is called by the framework and always sets m_bReadAhead to
TRUE. Correct me if I am wrong, but my understanding of the purpose of
this code is that it is supposed to deserialize a stream containing the
property values of the OLE object for the sake of persistence.

Where does this stream come from? If a disk file or a registry entry,
what would it be called?

The m_bReadAhead property currently defaults to FALSE, but in previous
builds of the OCX, it used to default to TRUE, do it is being more
persistent than I would like. When does the value of the property get
put into persistent storage?

My apologies if the question is either too esoteric or too naive, but I
am desperate.

.

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