title: Kendo UI Grid, Add columns and columns sum values
body: <p>I'm working with the Kendo Grid tool. 
  I have a data source which contains values ​​of an object and in this object exists another one.  Is like two array, one inside the another one.</p>
  
  <pre><code>$("#PedidoConsolidadoGrid").kendoGrid({
      dataSource: {
          data: mData,
          schema: {
              model: { // define the model of the data source. Required for validation and property types.
                  id: "CodigoArticulo",
                  fields: {
                      //CodigoPedido: { editable: false },
                      CodigoArticulo: { editable: false },
                      FechaPedido: { editable: false },
                      CantidadExistencias: { editable: false },
                      DescripcionArticulo: { editable: false },
                      CantidadConsolidar: {
                          editable: true, 
                          type: "number", 
                          validation: { required: true, min: 0, max: 9999 },
                      },
                  }
              }
          },
          pageSize: 11
      },
      scrollable: true,
      pageable: true,
      editable: {
          mode: "inline", // mode can be incell/inline/popup with Q1 '12 Beta Release of Kendo UI
          confirmation: false // the confirmation message for destroy command
      }, // enable editing
      selectable: "single",
      pageable: {
          numeric: true,
          previousNext: true,
          refresh: true,
          buttonCount: 5,
          messages: {
              display: "Mostrando {0}-{1} de {2}",
              empty: "No hay datos para mostrar",
              page: "Enter page",
              of: "de {0}",
              itemsPerPage: "Pedidos por página",
              first: "Primera página",
              last: "Última página",
              next: "Siguiente",
              previous: "Anterior",
              refresh: "Refrescar"
          }
       },
       columns: [
           //{ field: "CodigoPedido", title: "Código del Pedido", width: "150px" },
           { field: "CodigoArticulo", title: mData[0].CodigoArticulo , width: "150px" },
           { field: "DescripcionArticulo", title: "Articulo", width: "200px" },
           { field: "FechaPedido", title: "Fecha Pedido", width: "150px", template: '#= kendo.toString( toDate(FechaPedido), "dd/MM/yyyy" ) #' },
           { field: "CantidadConsolidar", title: "Total Pedido", width: "120px", },
           { field: "CantidadExistencias", title: "Total Existencia", width: "120px" },
           { command: "edit", text: "Editar"}
       ],
  });
  </code></pre>
  
  <p>How should I create the columns, for data that are in the array into another array?
  and how to sum columns and display the total in another column of the grid.</p>