[CLOSED] Dynamically Build TreePanel with PageTreeLoader

[HOWARDJ]

I'm trying to dynamically add a treepanel with loader and all works fine until I click to expand the root node then I get the error message "The control with ID 'SP_2' not found" Which is the ID of the TreePanel. Any thoughts?

Code Behind called from Page_Load event:

   Private Sub BuildPrivateSiteMenu()
        Dim tree As New TreePanel()
        tree.ID = "SP_2"
        tree.Title = "Online Users"
        tree.RootVisible = True
        Dim root As New Ext.Net.AsyncTreeNode()
        root.NodeID = "AAA_ROOT"
        root.Text = "SP"
        root.Expanded = False
        tree.Root.Add(root)
        Dim loader As New PageTreeLoader()
        AddHandler loader.NodeLoad, AddressOf GetPrivateNodes
        loader.PreloadChildren = True
        tree.Loader.Add(loader)

        WestPanel.Items.Add(tree)
    End Sub

GetPrivateNodes function never gets called:

 Protected Sub GetPrivateNodes(ByVal sender As Object, ByVal e As NodeLoadEventArgs)
    End Sub

Partial ASPX Page:

 <ext:Panel ID="WestPanel" runat="server" Region="West" Split="true" Collapsible="true"
                    Title="Enterprise Navigator" Width="225" BodyStyle="background-color: transparent;"
                    Border="true" Layout="AccordionLayout">
                    <Items>
                        <ext:TreePanel ID="tpPublic" runat="server" Width="300" Icon="BookOpen" RootVisible="false"
                            AutoScroll="true" UseArrows="true" Border="false" ViewStateMode="Enabled" ContainerScroll="true">
                            <Root>
                                <ext:AsyncTreeNode NodeID="AAA_ROOT" Text="Station Public" Expanded="true" />
                            </Root>
                            <Loader>
                                <ext:PageTreeLoader OnNodeLoad="GetPublicNodes" PreloadChildren="true">
                                    <BaseParams>
                                        <ext:Parameter Name="Site" Value="1" Mode="Value" />
                                    </BaseParams>
                                    <EventMask ShowMask="true" Target="Parent" Msg="Loading..." />
                                </ext:PageTreeLoader>
                            </Loader>
                        </ext:TreePanel>
                    </Items>
                    <Plugins>
                        <ext:KeepActive ID="KeepActive1" runat="server" />
                    </Plugins>
                </ext:Panel>

[Daniil]

Hi @HOWARDJ,

The PageTreeLoader OnNodeLoad event is a DirectEvent.

A control's DirectEvent requires a control instance on a server.

I'm trying to dynamically add a treepanel with loader

I assume you render a TreePanel during an AJAX request (DirectEvent or DirectMethod). Is that correct?

If so, then, I guess you don't recreate the TreePanel control during other AJAX requests.

You can recreate the TreePanel control.

But I would prefer to load nodes one of these ways.
https://examples1.ext.net/#/TreePane...Method_Loader/
https://examples1.ext.net/#/TreePane...Using_Handler/
https://examples1.ext.net/#/TreePane...iceTreeLoader/