selected rows and checkboxes...

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   I have a report control with a checkbox in column zero.  When I select several rows and click a checkbox in one of those rows, I want the checkboxes to all turn on (or off).  I tried iterating through the selected rows, but it seems that clicking the checkbox changes the selection count to one, because I never iterate more than once.  

Do I need to do something else to find the underlying selection?  The selection remains highlighted.

Here's a stub of my code, in case you see something there:

void CDrawingPropertiesWnd::OnReportButtonCheck(NMHDR* pNotifyStruct, LRESULT* result)
{

XTP_NM_REPORTRECORDITEM* pItemNotify = (XTP_NM_REPORTRECORDITEM*) pNotifyStruct;

int nColumn = pItemNotify->pColumn->GetItemIndex();

CXTPReportRecordItemCheckbox* cb = (CXTPReportRecordItemCheckbox*)pItemNotify->pItem;

switch(nColumn)

{
case columnShowHide:

{
CXTPReportRecordItemCheckbox* cb = (CXTPReportRecordItemCheckbox*)(pItemNotify->pItem);

BOOL bVis = (cb->IsChecked() ? TRUE : FALSE); // value to set for all selected rows...

CXTPReportSelectedRows* rows = m_DrawingReport.GetSelectedRows();

for(int xx=0;xx<rows->GetCount();xx++)

{
CXTPReportRow* row = rows->GetAt(xx);

int nRow = row->GetIndex();

CXTPReportRecordItemCheckbox* cbShowHide = (CXTPReportRecordItemCheckbox*)row->GetRecord()->GetItem(columnShowHide);

cbShowHide->SetChecked(bVis);

OnShowHide(cbShowHide,nColumn,nRow);

}
}
break;