public class MyGridItem
{
	public string ID { get; set; }
	public string Name { get; set; }
	public string ParentID { get; set; }
	public bool IsIncluded { get; set; }
	public bool IsExcluded { get; set; }
}

<telerik:RadTreeList ID="RadTreeMarkers" runat="server" ParentDataKeyNames="ParentID" DataKeyNames="ID" AutoGenerateColumns="false"
	OnNeedDataSource="RadTreeMarkers_NeedDataSource" AllowMultiItemEdit="true" ExpandCollapseMode="Client" EditMode="InPlace"
	AllowPaging="false" AllowSorting="false" OnItemDataBound="RadTreeMarkers_ItemDataBound">
	<Columns>
		<telerik:TreeListBoundColumn DataField="ID" UniqueName="ID" Visible="false" ForceExtractValue="Always"></telerik:TreeListBoundColumn>
		<telerik:TreeListBoundColumn DataField="ParentID" UniqueName="ParentID" Visible="false"></telerik:TreeListBoundColumn>
		<telerik:TreeListBoundColumn DataField="Name" UniqueName="Name" HeaderText="Mark" ReadOnly="true"></telerik:TreeListBoundColumn>
		<telerik:TreeListCheckBoxColumn DataField="IsIncluded" UniqueName="IsIncluded" HeaderText="Included" ForceExtractValue="Always"></telerik:TreeListCheckBoxColumn>
		<telerik:TreeListCheckBoxColumn DataField="IsExcluded" UniqueName="IsExcluded" HeaderText="Excluded" ForceExtractValue="Always"></telerik:TreeListCheckBoxColumn>
	</Columns>
</telerik:RadTreeList>

protected void RadTreeMarkers_NeedDataSource(object sender, TreeListNeedDataSourceEventArgs e)
{
	var treeData = MyFacade.GetTreeData();
	var treeDataGridItems = treeData.Select(m => new GridItem
	{
		ID = m.ID.ToString(),
		Name = m.Name,
		ParentID = m.ParentID.HasValue ? m.ParentID.Value.ToString() : string.Empty,
		IsIncluded = m.IsIncluded.HasValue && m.IsIncluded == true,
		IsExcluded = m.IsIncluded.HasValue && m.IsIncluded == false
	}
	).ToList();
	RadTreeMarkers.DataSource = treeDataGridItems;
}

protected void RadTreeMarkers_ItemDataBound(object sender, TreeListItemDataBoundEventArgs e)
{
	if (e.Item is TreeListDataItem item)
	{
		item.Edit = true;
	}
}

                    <telerik:GridButtonColumn UniqueName="ImageButton" CommandName="MarkRecord" ButtonType="ImageButton"
                        ImageUrl="Content/Images/Reverse.jpg" HeaderStyle-Width="60px" Exportable="false">
                    </telerik:GridButtonColumn>
                    <telerik:GridBoundColumn UniqueName="Sections" DataField="Sections" HeaderText="Sections" HeaderStyle-Width="180px" Exportable="false">
                        <FilterTemplate>
                            <telerik:RadComboBox ID="ddlSection" runat="server" DataSource="<%#Sections %>"
                                DataTextField="Name" DataValueField="Name" Width="130px" AppendDataBoundItems="true"
                                SelectedValue='<%# ((GridItem)Container).OwnerTableView.GetColumn("Sections").CurrentFilterValue %>'
                                OnClientSelectedIndexChanged="SectionsIndexChanged">
                                <Items>
                                    <telerik:RadComboBoxItem Text="All" />
                                </Items>
                            </telerik:RadComboBox>
                            <telerik:RadScriptBlock ID="RadScriptBlock3" runat="server">
                                <script type="text/javascript">
                                    function SectionsIndexChanged(sender, args) {
                                        var tableView = $find("<%# ((GridItem)Container).OwnerTableView.ClientID %>");
                                        alert(args.get_item().get_value());
                                        tableView.filter("Sections", args.get_item().get_value(), "EqualTo");
                                    }
                                </script>
                            </telerik:RadScriptBlock>
                        </FilterTemplate>
                    </telerik:GridBoundColumn>

        protected void RadGrid1_ItemCommand(object sender, GridCommandEventArgs e)
        {
            string strNewStatus;
            string btnAction;
            if(e.CommandName == "Complete" || e.CommandName == "Reverse")
            {
                if (e.CommandName == "Complete")
                {
                    strNewStatus = "COMPLETE";
                    btnAction = "Mark Complete";
                }
                else
                {
                    strNewStatus = "PENDING";
                    btnAction = "Reverse Complete";
                }
                GridDataItem dataItem = e.Item as GridDataItem;
                var id = (int)dataItem.OwnerTableView.DataKeyValues[dataItem.ItemIndex]["EncounterID"];
                Encounter enc = Encounters.Find(i => i.EncounterID == id);
                string userName = HttpContext.Current.User.Identity.Name.Replace("ROTHMAN\\", String.Empty);
                string retValue;
                retValue = DataAccess.UpdateVisitInfo(Convert.ToInt32(enc.tid), enc.EncounterID, enc.ECWAcct, userName, strNewStatus, enc.notes, ddlSource.SelectedValue);
                if (retValue != "")
                {
                    //handle error
                    e.Canceled = true;
                    radWindowManager.RadAlert(retValue, 280, 100, "Error", null);
                    return;
                }
                retValue = DataAccess.UpdateTracker(userName, enc.EncounterID, Convert.ToInt32(enc.ECWAcct), btnAction, strNewStatus, "", ddlSource.SelectedValue);
                if (retValue != "")
                {
                    e.Canceled = true;
                    radWindowManager.RadAlert(retValue, 280, 100, "Error", null);
                    return;
                }
                // refresh grid
                Session["Encounters"] = null;
                RadGrid1.Rebind();
            }
        }