1. The corporate hierarchy is quite large, so I'm only wanting to load the direct reports when a person clicks on a person within the hierarchy. Otherwise, the CEO and several upper managers will get timeouts when they load the page (because of the large hierarchy). I know the system can handle on-demand loading of child elements, though I cannot figure out how to do it.
   
   I'm building the initial collection of objects via a WCF service when the user first enters the page, based on their AD Sam Account Name. The collection includes an (int) ID and (int) ParentID - as I understand this is the only way to properly indicate the hierarchical relationships. This is a short list as a rule, and it works for the first load of the page (I'm using the NeedDataSource event handler for all this so far).
   
   I see the individual and their immediate direct reports (but these reports don't have an expander (+/-) button because I haven't loaded their direct reports - I want to do that on selection).
   
   I have a method that can check if a person has direct reports, so I can call that for each person in the direct reports list, but how do I show the expander button if they have reports without loading any data yet? I don't want to load that person's direct reports until they have been selected.
   
   
2. Which leads me to the second problem: How do I append a selected person's direct reports to the current treelist's collection on selection? I know I can get the list of items, convert to a collection, append the new direct reports items, and rebind... but... 
   
   
3. How do I get the selected person's Sam Account Name (which is bound to the item, so I know it's available)? 
   
   
4. Which event should fire to reconstitute the collection and rebind?
   
   
5. If I can get the info to do all of that on the correct event handler, then the only other thing I need to know is how can I make a column value (i.e. the person's full name) be the actual selectable button instead of the expander icon? This would be preferable.
   
   
6. Is the RadTreeView the right control for this job???

<telerik:RadPanelBar ID="rpbAddFilters" runat="server">

    <Items>

        <telerik:RadPanelItem Text="RadPanelItem" runat="server">

            <Items>

                <telerik:RadPanelItem Value="test" runat="server">

                    <ItemTemplate>

                        <telerik:RadCodeBlock ID="RadCodeBlock2" runat="server">

                                        <asp:Panel ID="pnlValues" runat="server">

                                `       </asp:Panel>

                        </telerik:RadCodeBlock>

                  </ItemTemplate> 
                </telerik:RadPanelItem >
            </Items>
         </telerik:RadPanelItem >
    </Items>
</RadPanelBar>

    var panelbar = $find("<%= rpbAddFilters.ClientID %>");

    var item = panelbar.findItemByValue("test");

    var pnlValues = item.findControl("pnlValues");