hierarchical grid will not expand to show child table and records

[Remi]

Hello,

We're using 2010 Q3 and running into some issues when attempting a hierarchical grid.

This code is based on the demo. The issue is the expand won't show the child records / table when the arrow beside a parent record is clicked. Nothing happens. No error.

Here is some sample code.

private void DefineGridStructure()
        {
            /* Hierarchy Grid - lab and test types for each lab */

            RadGrid oRadGridLab = new RadGrid();

            oRadGridLab.ID = "TelRadGridLab";

            var oLaboratories
                = (from p in this.Core.EntityModel.Laboratories
                   select p).ToList();

            oRadGridLab.DataSource = oLaboratories;
            oRadGridLab.DataMember = "Laboratory";
           

            oRadGridLab.MasterTableView.DataKeyNames = new string[] { "Idn" };

            oRadGridLab.Skin = "Office2007";

            oRadGridLab.Width = Unit.Percentage(98);
            oRadGridLab.PageSize = 3;
            oRadGridLab.AllowPaging = true;
            oRadGridLab.AllowSorting = true;
            oRadGridLab.PagerStyle.Mode = GridPagerMode.NumericPages;
            oRadGridLab.AutoGenerateColumns = false;
            //oRadGridLab.MasterTableView.GroupLoadMode = GridGroupLoadMode.Client;

            oRadGridLab.MasterTableView.PageSize = 3;

            //Add columns
            GridBoundColumn boundColumn;
            boundColumn = new GridBoundColumn();
            boundColumn.DataField = "Idn";
            boundColumn.HeaderText = "Idn";
            oRadGridLab.MasterTableView.Columns.Add(boundColumn);

            boundColumn = new GridBoundColumn();
            boundColumn.DataField = "Name";
            boundColumn.HeaderText = "Name";
            oRadGridLab.MasterTableView.Columns.Add(boundColumn);

            oRadGridLab.DataBind();

            //Detail table - Test Types (II in hierarchy level)
            GridTableView oTableViewTestTypes = new GridTableView(oRadGridLab);

            var oTestTypes
                = (from p in this.Core.EntityModel.TestTypeToLaboratories
                   select p).ToList();

            oTableViewTestTypes.DataSource = oTestTypes;
            oTableViewTestTypes.DataMember = "TestTypeToLaboratory";         
                       
            oTableViewTestTypes.Width = Unit.Percentage(100);

            oTableViewTestTypes.DataKeyNames = new string[] { "Idn" };

            GridRelationFields relationFields = new GridRelationFields();
            relationFields.MasterKeyField = "Idn";
            relationFields.DetailKeyField = "LaboratoryIdn";
            oTableViewTestTypes.ParentTableRelation.Add(relationFields);

            oRadGridLab.MasterTableView.DetailTables.Add(oTableViewTestTypes);

            //Add columns
            boundColumn = new GridBoundColumn();
            boundColumn.DataField = "LaboratoryIdn";
            boundColumn.HeaderText = "LaboratoryIdn";
            oTableViewTestTypes.Columns.Add(boundColumn);

            boundColumn = new GridBoundColumn();
            boundColumn.DataField = "CreatedOn";
            boundColumn.HeaderText = "CreatedOn";
            oTableViewTestTypes.Columns.Add(boundColumn);

            boundColumn = new GridBoundColumn();
            boundColumn.DataField = "ModifiedOn";
            boundColumn.HeaderText = "ModifiedOn";
            oTableViewTestTypes.Columns.Add(boundColumn);

            oTableViewTestTypes.DataBind();   

            //Add the RadGrid instance to the controls
            this.AspPlaceHolder.Controls.Add(oRadGridLab);
        }

Thank you in advance for your assistance and considerations.

[Pavlina]

Hi Remi,

Note that hierarchical grid structure is not supported with simple data-binding (calling DataBind()). To bind each detail table-view, Telerik RadGrid fires the DetailTableDataBind event. The argument carries all needed information such as the table that should be data bound, parent item(s), etc. Please refer to the online examples below for more information:
Programmatic Binding 
Creating Hierarchy Programmatically 

All the best,
Pavlina
the Telerik team