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I have the report grid setup so that the first column is grouped on. Now I want to go and update the text displayed in the grouping label. This is what I have tried and it fails to get the cell.

How is this supposed to be done?

//get the root item
    HTREEITEM hRoot = ItemGetRoot();

    //check the item
    if(!hRoot)
        return;

    //get the first item
    HTREEITEM hItem = this->ItemGetFirstChild(hRoot);

    //parse the children of root
    while(hItem)
    {
        //get the cell
        CExtGridCell *pCell = this->ItemGetCell(hItem, 0);

        //get the text of the cell
        CString strCell;
        pCell->TextGet(strCell);
        
        //get the next item
        hItem = this->ItemGetNext(hItem, true, false, false);
    }

Although CExtReportGridWnd class is derived from the CExtTreeGridWnd class and you can also use a HTREEITEM-handle based API implemented in the report grid. You can modify grid cells in the CExtReportGridColumn* columns of CExtReportGridItem* report items using CExtReportGridWnd::ItemGetCell() and finaly update the sort order using CExtReportGridWnd::ReportSortOrderUpdate().