ParentGrid lost after ChildGrid's Expand event

[Prava kafle]

Hi,
I am creating  a  dynamic nested  grid  to replicate grid displayed in following site.
 http://demos.telerik.com/aspnet-ajax/grid/examples/hierarchy/nestedviewtemplate/defaultcs.aspx

When I expand  an item in child grid to display grandChild grid, the nestedview template on top level  is empty and  I lose all controls. How can I persist nested grids  on post back.


Here is my code to create root grid, child grid is also created with same logic.

1.
  protected void Page_Init(object source, System.EventArgs e)
        {
            try
            {      
                RadGrid rootGrid = CreateDynamicGrid("Ticket");
                NGridPlaceHolder.Controls.Add(rootGrid);
            }
            catch(Exception ex)
            {
                WIMProject.ShowMessageBox(ex.ToString());
            }
        }


2.
 public RadGrid CreateDynamicGrid(string tableName)
        {
            RadGrid radGrid = new RadGrid();
            try
            {
                radGrid.ID = tableName + "_RootGrid";
                radGrid.AutoGenerateColumns = true;
                radGrid.PageSize = 20;
                radGrid.MasterTableView.AllowPaging = true;
                radGrid.PagerStyle.Mode = GridPagerMode.NextPrevAndNumeric;
                radGrid.MasterTableView.DataKeyNames = new string[] {"ID" };
                radGrid.MasterTableView.HierarchyLoadMode = GridChildLoadMode.ServerOnDemand;
                radGrid.MasterTableView.TableLayout = GridTableLayout.Auto;
                radGrid.MasterTableView.NestedViewTemplate = new NestedGridTemplate();
                radGrid.ItemCommand += new GridCommandEventHandler(radGrid_ItemCommand);
                radGrid.ItemDataBound += new GridItemEventHandler(radGrid_ItemDataBound);

              radGrid.NeedDataSource += new GridNeedDataSourceEventHandler(radGrid_NeedDataSource);

        .........}


3.
        void radGrid_ItemDataBound(object sender, GridItemEventArgs e)
        {
                  string gridID = e.Item.OwnerID;
                  string tableName = gridID.Replace("_RootGrid", "");

                  if (e.Item.GetType() == typeof(GridDataItem) && e.Item.Expanded)
                      {
                          GridDataItem currentDataItem = (e.Item as GridDataItem);
                          string selectedRowID = currentDataItem.GetDataKeyValue("ID").ToString();

                          Panel currentPanel = new Panel();
                          currentPanel.CssClass = "GridWrapperPanel";

                          NestedGridTemplate nestedGridTemplate = new NestedGridTemplate();
                          nestedGridTemplate.CreateTabStrip(tableName, currentPanel, selectedRowID);

                         (currentDataItem as GridDataItem).ChildItem.NestedViewCell.Controls.Add(currentPanel);
                      }
           
        }


Thanks,
Prava

[Pavlina]

Hello Prava,

Please refer to the code library below which elaborates on this subject and see if it helps to resolve this problem:
http://www.telerik.com/community/code-library/aspnet-ajax/grid/programmatic-creation-of-radgrid-hierarchy-with-templates.aspx

Best wishes,
Pavlina
the Telerik team