is there a dirty flag for property pages

[Technokrat]

Is there a dirty flag for property pages. In other words what, or how does a property page communicate to its parent that it is dirty(data has changed)?

I have a dialog with four tabs(property pages), and changes to the first tab are recognized by the dialog and it prompts the user with the standard save changes, yes/no/cancel. If a change is made on a tab other than the first, and a subsequent tab is clicked on, the dialog never recognizes the changes and the close button just exits the dialog without prompting the user or saving any of the changes.

 

[Technokrat]

just to add a little more background info/specifics

I've added the following to DoFieldExchange:

DFX_Long(pFX, _T("[ProductUse]"), m_ProductUse, AFX_DAO_DISABLE_FIELD_CACHE);

Which according to the MFC/DAO help says I should be able to manually set the field as dirty so it will be saved by doing the following

m_pSet->SetFieldNull(&m_pSet->m_ProductUse, FALSE);
m_pSet->SetFieldDirty(&m_pSet->m_ProductUse, TRUE);

The ProductUse field is actually derived from 3 checkboxes on the dialog, one for each of the following ORDERING, RECEIVING, COUNTING. So, as an example, my logic for the user clicking on the Receiving checkbox is as follows:

void cPgInvGenInfo::OnChkReceiving() 
{
m_pSet->SetFieldNull(&m_pSet->m_ProductUse, FALSE);
m_pSet->SetFieldDirty(&m_pSet->m_ProductUse, TRUE);

if( ((CButton*)GetDlgItem(IDC_CHK_RECEIVING))->GetCheck() )
m_pSet->m_ProductUse |= 00000010;
else
m_pSet->m_ProductUse &= 11111101;
}

When I click close on the dialog, it happily closes without prompting to save changes, and exits without saving.