public interface IActivityInstanceBase : IDataLayerBase
    {
        string Id { get; set; }
        DateTime ExecutionDate { get; set; }
        DateTime PlannedDate { get; set; }
.....
        string ActivityInstanceName { get; set; }
        string ParentId { get; set; } 
    }

    public interface IActivityInstance : IActivityInstanceBase, IExportable, IFileAddable
    {
        IMaintenanceGroup MaintenanceGroup { get; set; }
        IActivity Activity { get; set; }
        IActivityStatus Status { get; set; }
.....
        string MaintenanceGroupName { get; set; }
        string ParentGroupName { get; set; }
    }

Datasource is of type IActivityInstance which inherits IActivityInstanceBase (connected over needdatasource event)

I have to group by a field from the base class (ParentId) which is not possible (Exception field not found in datasource).

In the definition of grid columns i can also use fields from the base class, only in the group by expression it isn´t possible.

Any ideas how to solve that?

regards,
Stefan

I would like to programmatically create a RadPanelBar using data binding from an object that implements the IEnumerable interface.

Furthermore, I would like to dynamically add a RadGrid to each created RadPanelItem.

The following program code does what I want, but unfortunately I am not able to get the SelectedIndexChanged event working for the Grids, which are included within the RadPanelBar.

I suppose, the problem is that the Grids for the RadPanelBar are created to late within the Page Live Cycle, because they should be created OnInit and not on the ItemDataBound event of the RadPanelBar.

I don’t know how to dynamically add Grids to the RadPanelBar, which have been created early enough within the page life cycle in order to maintain their view state. Does anybody know a solution for this issue?

public class EOBDCode

    {

        public string Code { get; set; }               

        public EOBDCode() {}

    }

    public partial class _Default : System.Web.UI.Page

    {              

        private List<EOBDCode> GetEOBDCodesList()

        {

            List<EOBDCode> list = new List<EOBDCode>();

            EOBDCode code;

            for (int i = 0; i < 3; i++)

            {

                code = new EOBDCode();

                code.Code = "P00" + i;               

                list.Add(code);

            }

            return list;

        }

        protected void Page_Init(object sender, EventArgs e)

        {           

            placeHolder.Controls.Add(CreateGrid("RadGrid1"));

        }

        protected void Page_PreRender(object sender, EventArgs e)

        {

            RadPanel1.DataTextField = "Code";

            RadPanel1.DataSource = GetEOBDCodesList();

            RadPanel1.DataBind();           

        }

        private RadGrid CreateGrid(string id)

        {

            RadGrid grid = new RadGrid();

            grid.ID = id;

            grid.ClientSettings.Selecting.AllowRowSelect = true;

            grid.SelectedIndexChanged += Grid_SelectedIndexChanged;

            grid.NeedDataSource += Grid_NeedDataSource;

            grid.ClientSettings.EnablePostBackOnRowClick = true;

            return grid;

        }

        protected void RadPanel_ItemDataBound(object sender, RadPanelBarEventArgs e)

        {

            EOBDCode row = (EOBDCode)e.Item.DataItem;

            RadPanelItem item = new RadPanelItem();

            item.Controls.Add(CreateGrid(row.Code));

            e.Item.Items.Add(item);

        }

        protected void Grid_NeedDataSource(object sender, EventArgs ea)

        {

            RadGrid grid = (sender as RadGrid);

            grid.DataSource = GetEOBDCodesList();

        }

        protected void Grid_SelectedIndexChanged(object sender, EventArgs e)

        {

            //not called for Grids included within the RadPanelBar,

            //but called for the Grid within the placeholder.

        }

<body>

    <form id="form1" runat="server">           

    <telerik:RadScriptManager ID="RadScriptManager1" runat="server">

    </telerik:RadScriptManager> 

    <div>

        <telerik:RadPanelBar ID="RadPanel1" runat="server" OnItemDataBound="RadPanel_ItemDataBound">      

        </telerik:RadPanelBar>

    </div>   

    <asp:PlaceHolder ID="placeHolder" runat="server"></asp:PlaceHolder>          

    </form>

</body>