How to preserve the selections?

I am using the report control to display a monitored data and constantly updated by a timer.

 

But, when there is an update by calling "Populate()", all the existing selections will be cleared.

 

Anyway to preserve the selection ? I have tried the following, but it crashed.

 

 

 

// Keep the previous selections
CArray<CXTPReportRow*,CXTPReportRow*> arrOldSelectedRows;
CXTPReportSelectedRows *pSelRows = GetSelectedRows();
int nRow;
for (nRow = 0; nRow < pSelRows->GetCount(); nRow++)
{
    arrOldSelectedRows.Add(pSelRows->GetAt(nRow));
}

 

Populate();   

// Restore the previous selections
pSelRows = GetSelectedRows();

for (nRow = 0; nRow < arrOldSelectedRows.GetSize(); nRow++)
{
    pSelRows->Add(arrOldSelectedRows.GetAt(nRow)); // Crash here!!!!
}

 

 

If crashed on this statement:

 

void CXTPReportSelectedRows::Add(CXTPReportRow* pRow)
{
 if (!pRow)
  return;

 _NotifySelChanging(xtpReportSelectionAdd, pRow);

 int nIndex = pRow->GetIndex(); //// Crashed here!

 if (nIndex != -1)
 {
  AddBlock(nIndex, nIndex);
 }
}

 

Any suggestion to preserve the selections?

 

Thanks.