<asp:ScriptManager runat="server" ID="ScriptManager1" />

<telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server">

<telerik:RadTreeView runat="server" ID="PHTreeView" CheckBoxes="true"
OnClientContextMenuItemClicked="RadTree_ContextMenuItemClick">
</telerik:RadTreeView>

<telerik:RadToolTipManager Width="215px" Skin="Sunset" Height="260px" HideDelay="1"
RelativeTo="Element" ID="PHToolTipMgr" runat="server" OffsetX="15" Position="MiddleRight"
OnAjaxUpdate="PHToolTipMgr_AjaxUpdate">
</telerik:RadToolTipManager>

</telerik:RadAjaxPanel>

<telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">

<script language="javascript">

function RadTree_ContextMenuItemClick(sender, eventArgs)
{
    var nodeElem= eventArgs.get_node();

    if(nodeElem.get_level() != 0)
    {

       var node = nodeElem.get_textElement();
       var tooltipManager = $find("<%= PHToolTipMgr.ClientID %>");

        if (!tooltipManager) return;

        var tooltip = tooltipManager.getToolTipByElement(node);

        if (!tooltip)

        {

            tooltip = tooltipManager.createToolTip(node);
            tooltip.set_value(nodeElem.get_value());
            tooltip.show();

        }
     }

}

</script>
 

</telerik:RadCodeBlock>

For the VB file, I am building the Tree from an XML String.  Also, I am not setting the TargetControls property of the Tooltip Manager Control.  Although, I have tried it and makes no difference.   When choosing a context menu the PageLoad does fire but the following does not fire.  I was hoping to load a usercontrol in the AjaxUpdate method.