I am using Manual On Load Demand to Bind child grid in my WHDG.

This is My Code:

 protected void WebHierarchicalDataGrid1_RowIslandsPopulating(object sender, ContainerRowCancelEventArgs e)

        {

//Cancel the default automatic load on demand operation

            e.Cancel = true;

            // Get the data key

            int key = (int)e.Row.DataKey[0];

            _item.DetailId = key;

            var p = itemRead();

             // Create Container Grid

            ContainerGrid childGrid = new ContainerGrid();

            childGrid.InitializeRow += Child_InitializeeRow;

            e.Row.RowIslands.Add(childGrid);

            // Bind Grid

            childGrid.DataSource = p;

            childGrid.DataBind();

}

  private bool isChild;

   protected void Child_InitializeeRow(object sender, RowEventArgs e)

        {

            isChild = true;

            var gridRecord = (ContainerGridRecord)e.Row;

            if (gridRecord.Items.Count == 0)

                return;

            // Sets theItem Column

            var columnItemID = (BoundDataField)gridRecord.Items[0].Column;

            columnItemID.Width = 200;

            columnItemID.Header.Text = "ItemID";

           // ---------------------------------

                 In this Area i need to insert a check box which will be the last column

           //------------------------------------

}

I got this code from the other thread but i don't know how to use it yet:  

     public class ActionChildItemTemplate : ITemplate

        {

            #region ITemplate Member

            public void InstantiateIn(Control container)

            {

                CheckBox chk = new CheckBox();

                chk.ID = "chk";

                container.Controls.Add(chk);

            }

            #endregion

        }

After that  i need to loop the child band that is checked by the user and reference the key from parent row.

Thanks in Regards