Here's the markup. This tree is the target of drag-and-drop from another tree.

The drag-and-drop functions work fine, but I can't get a function to clear the tree working.

 <ignav:UltraWebTree ID="IncludeList" runat="server" AllowDrop="True" AllowDrag="True"
         ForeColor="Black" BackColor="White" InitialExpandDepth="2" Font-Names="Verdana"
         Font-Size="8pt" WebTreeTarget="HierarchicalTree" Indentation="20" Width="300px"
         Height="180" Cursor="Default" BorderColor="#666666" BorderWidth="3px">
         <Levels>
                  <ignav:Level Index="0" />
         </Levels>
         <NodeMargins Top="2px"></NodeMargins>
         <AutoPostBackFlags NodeChecked="False" NodeCollapsed="False" NodeDropped="False"
                   NodeExpanded="False" />
          <ClientSideEvents DragStart="UltraWebTree2_DragStart" Drop="UltraWebTree2_Drop">
          </ClientSideEvents>
</ignav:UltraWebTree>