Multi-Row Columns Header

        public RadForm1()
        {
            InitializeComponent();

            this.radVirtualGrid1.RowCount = 100;
            this.radVirtualGrid1.ColumnCount = 5;
            this.radVirtualGrid1.CellValueNeeded += radVirtualGrid1_CellValueNeeded;
            this.radVirtualGrid1.CellFormatting += radVirtualGrid1_CellFormatting;
        }
        
        private void radVirtualGrid1_CellFormatting(object sender, VirtualGridCellElementEventArgs e)
        {
            if (e.CellElement.RowIndex > -1 && e.CellElement.ColumnIndex < 0)
            {
                e.CellElement.DrawText = true;
                e.CellElement.Text = e.CellElement.RowIndex.ToString() ;
            }
        }

        private void radVirtualGrid1_CellValueNeeded(object sender, VirtualGridCellValueNeededEventArgs e)
        {
            e.Value = "Data" + e.RowIndex + e.ColumnIndex;
        }