How to get first cell data in child grid of hierachy grid

Hi,
I m  using kendo Hierarchy  grid. In child grid I put a "edit" button. So I need to get child row first column data (ID) when I click the edit button.
 My detailInit function and clickbfunction is here.

function detailInit(e) {                       
             var    _Po_sectionID =e.data.SectionID;
                                    $("<div/>").appendTo(e.detailCell).kendoGrid({
                                        dataSource: {
                                            transport: {
                                                read: _PostionsBySectionUrl + _Po_sectionID
                                            },
                                            schema: {
                                                data: "Data",
                                                total: "Count"
                                            },                                    
                                        },
                                        scrollable: false,
                                        sortable: true,
                                        pageable: true,
                                        columns: [
                               
                                            { field: "ContainerID", title: "Possition ID",hidden:true },
                                            { field: "ContainerName", title: "ContainerName",hidden:true  },
                                            {
                                                title: "Action", width: 95, command: [
                                                          {
                                                              id: "edit",
                                                              name: "edit",
                                                              click: OnPositionRowSelect,
                                                              template: "<a class='k-button k-grid-edit' href='' style='min-width:16px;'><span class='k-icon k-edit'></span></a>"
                                                          }                                                       
                                                    ]
                                                },
                                        ]
                                    });
 } 

 function OnPositionRowSelect(e) {
                 e.preventDefault();
                 _ _ _ _ _  _ _ _ _ _   _ _ _ _ _  _ _ _ _ _  _ _ _ _ _
                 _ _ _ _ _  _ _ _ _ _   _ _ _ _ _  _ _ _ _ _  _ _ _ _ _
                _ _ _ _ _  _ _ _ _ _   _ _ _ _ _  _ _ _ _ _  _ _ _ _ _
               _ _ _ _ _  _ _ _ _ _   _ _ _ _ _  _ _ _ _ _  _ _ _ _ _
               alert("Container Id : "+ ContainerID);

 }

Regards