RadTreeList isn't loading on page load

[Roukaya]

I'm having a problem in radtreelist and it isn't loading on page load the radtreelist is inside a radmultipage the code is like this :

<telerik:RadTabStrip ID="RadTabStrip1" runat="server" MultiPageID="RadMultiPage1"
                        SelectedIndex="0" ReorderTabsOnSelect="true" Align="Justify" Width="220px"  >
                        <Tabs>
   <telerik:RadTab Text="<%$Resources:Strings,Stores %>" >
                            </telerik:RadTab>
   <telerik:RadMultiPage ID="RadMultiPage1" runat="server" Width="100%">
   <telerik:RadPageView ID="StoresPageView" runat="server">
                        <telerik:RadAjaxPanel ID="Ajpanel" runat="server">
                           <telerik:RadTreeList ID="StoreTreeList" runat="server"   HideExpandCollapseButtonIfNoChildren="true"
                                ParentDataKeyNames="PARENT_STORE_ID" DataKeyNames="STORE_ID" AllowPaging="false" GridLines="Horizontal"
                                AutoGenerateColumns="false" AllowSorting="true" AllowMultiItemSelection="true" OnNeedDataSource="StoreTreeList_NeedDataSource">
                                <ItemStyle  HorizontalAlign="Left" />
                               <ClientSettings><Scrolling UseStaticHeaders="true"  AllowScroll="true"  /> </ClientSettings>
                                <Columns>

                                    <telerik:TreeListSelectColumn  ></telerik:TreeListSelectColumn>
                                    <telerik:TreeListTemplateColumn  Display="false" >
                                    <ItemTemplate>
                                    <asp:HiddenField ID="hf_StoreID" runat="server" Value='<%# Eval("STORE_ID") %>' />
                                    </ItemTemplate>
                                    </telerik:TreeListTemplateColumn>
                                    <telerik:TreeListBoundColumn DataField="STORE_NAME" HeaderText="Stores" >
                                    </telerik:TreeListBoundColumn>

                                </Columns>
                            </telerik:RadTreeList>
                         </telerik:RadAjaxPanel>
                        </telerik:RadPageView>

server side :

protected void StoreTreeList_NeedDataSource(object sender,TreeListNeedDataSourceEventArgs e)
{
    BindTreeList();

}

  private void BindTreeList()
 {

   StoresDT.Select("STORE_ID=" + new WebSiteDataHelper().SelectedStoreID.Value)[0]["PARENT_STORE_ID"] = 0;
   StoreTreeList.DataSource = StoresDT;
 }
  protected void Page_Load(object sender, EventArgs e)
  {
   if (!IsPostBack)
    {
          StoreTreeList.ExpandAllItems();
    }
  }

[Kostadin]

Hi Roukaya,

Could you please elaborate a little bit more on your scenario? I prepared a small sample based on your code and attached it to this thread. Please give it a try and let me know how it differs from your real setup.

Kind regards,
Kostadin
the Telerik team