Re: CListView Vista Problem

We are modifying a CListView Control as follows:

void CMyListView::OnClick(NMHDR* pNMHDR, LRESULT* pResult)
{
 int iItem;

 NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR;

 if (!pNMListView->uOldState && !pNMListView->uNewState)
   return;

 // Process the click
 ...
}

When we use this control with the above custom code in Windows XP, Clicking
in the checkbox results in:

pNMListView->uOldState = 1031
pNMListView->uNewState = 0

and the rest of our code executes just fine.

When we use this control in Windows Vista, Clicking in the checkbox results
in:

pNMListView->uOldState = 0
pNMListView->uNewState = 0

and the rest of our code does not execute.

If I remove the check "if (!pNMListView->uOldState &&
!pNMListView->uNewState)", the code executes just fine, but I'd like to
understand why the values are different for XP and Vista before removing this
check.