UserControl disapears after the second postback (ajax request)

[Stephane]

Hi,
I build an aspx page which contains only one RadTabStrip and its RadMultiPage.

In the page_load event (in the behind code), I build dynamically the RadTabStrip and the RadMultiPage

protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            string[] arguments = Session[SessionParameterName.LISTDOCTOVISU] as string[];
            for (int i = 0; i < arguments.Length; i++)
            {
                AddTab(arguments[i]);
                AddPageView(RadTabStripDocView.Tabs[i]);
            }
        }
    }

For each value the named Session field, i create a RadTab and a PageView, like in the live demo example.
I also implemented the function AddTab and AddPageView

private void AddTab(string codeDoc)
    {
        RadTab tab = new RadTab();
        tab.Text = codeDoc;
        tab.Attributes.Add("CodeDoc", codeDoc);
        tab.Value = codeDoc;
        RadTabStripDocView.Tabs.Add(tab);
    }

    private void AddPageView(RadTab tab)
    {
        RadPageView pageView = new RadPageView();
        pageView.ID = "PageView_ID_" + tab.Value;
        pageView.Attributes.Add("CodeDoc", tab.Value);
        RadMultiPageDocView.PageViews.Add(pageView);
        tab.PageViewID = pageView.ID;
    }

and the event PageViewCreate on the RadMultiPage

protected void RadMultiPage1_PageViewCreated(object sender, RadMultiPageEventArgs e)
    {
        string codeDoc = e.PageView.Attributes["CodeDoc"];
        if (!string.IsNullOrEmpty(codeDoc))
        {
            string userControlName = "usercontrol/ViewerDocument.ascx";
            ViewerDocument userControl = Page.LoadControl(userControlName) as ViewerDocument;
            userControl.ID = e.PageView.ID + "_ViewerDocument";
            userControl.CodeDoc = e.PageView.Attributes["CodeDoc"];
            e.PageView.Controls.Add(userControl);
        }
    }

My user control content:

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="ViewerDocument.ascx.cs"
    Inherits="Class_iWebAsp.usercontrol.ViewerDocument" %>
<telerik:RadCodeBlock runat="server" ID="PreviewDocumentForMultiDocCodeBlock">
    <script type="text/javascript">
    </script>
</telerik:RadCodeBlock>
<telerik:RadAjaxManagerProxy ID="RadAjaxManagerProxy1" runat="server">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="RadToolBarPaging">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="RadSplitter1" LoadingPanelID="RadAjaxLoadingPanel1"  />
            </UpdatedControls>
        </telerik:AjaxSetting>
    </AjaxSettings>
</telerik:RadAjaxManagerProxy>
<telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Skin="Default">
</telerik:RadAjaxLoadingPanel>
<telerik:RadSplitter ID="RadSplitter1" runat="server" Width="100%" Height="100%"
    Orientation="Horizontal">
    <telerik:RadPane ID="RadPaneToolBarPaging" runat="server" Scrolling="None" Height="35px"
        Width="100%">
        <telerik:RadToolBar ID="RadToolBarPaging" runat="server" AutoPostBack="true" OnButtonClick="RadToolBarPaging_buttonClick"
            Width="100%">
            <Items>
                <telerik:RadToolBarButton ImageUrl="../images_toolbar/arrow_first.gif" Value="first">
                </telerik:RadToolBarButton>
                <telerik:RadToolBarButton ImageUrl="../images_toolbar/arrow_prev.gif" Value="prev">
                </telerik:RadToolBarButton>
                <telerik:RadToolBarButton IsSeparator="true">
                </telerik:RadToolBarButton>
                <telerik:RadToolBarButton PostBack="false" Value="info">
                    <ItemTemplate>
                        <asp:Label ID="LabelInfo" runat="server" Text="Page 1/1"></asp:Label>
                    </ItemTemplate>
                </telerik:RadToolBarButton>
                <telerik:RadToolBarButton IsSeparator="true">
                </telerik:RadToolBarButton>
                <telerik:RadToolBarButton ImageUrl="../images_toolbar/arrow_next.gif" Value="next">
                </telerik:RadToolBarButton>
                <telerik:RadToolBarButton ImageUrl="../images_toolbar/arrow_last.gif" Value="last">
                </telerik:RadToolBarButton>
                <telerik:RadToolBarButton IsSeparator="true" />
                <telerik:RadToolBarButton ImageUrl="../images_toolbar/zoom_arriere_16x.png" Value="zoommois"
                    PostBack="false">
                </telerik:RadToolBarButton>
                <telerik:RadToolBarButton ImageUrl="../images_toolbar/zoom_avant_16x.png" Value="zoomplus"
                    PostBack="false">
                </telerik:RadToolBarButton>
                <telerik:RadToolBarButton IsSeparator="true">
                </telerik:RadToolBarButton>
                <telerik:RadToolBarButton ImageUrl="../Icons/pdf.jpg" Value="saveas" Target="_blank"
                    PostBack="false" ToolTip="Télécharger(version PDF)">
                </telerik:RadToolBarButton>
                <telerik:RadToolBarButton ImageUrl="../Images/saveas.gif" Value="saveasOri" Target="_blank"
                    PostBack="false" ToolTip="Télécharger(vesion original)">
                </telerik:RadToolBarButton>
                <telerik:RadToolBarButton ImageUrl="../Images/print.gif" Value="print" PostBack="false"
                    Visible="false" ToolTip="Imprimer">
                </telerik:RadToolBarButton>
            </Items>
        </telerik:RadToolBar>
    </telerik:RadPane>
    <telerik:RadPane ID="RadPanePreviewDoc" runat="server">
        qsfhklqjfqklsfqklfjqlfjqlkf
    </telerik:RadPane>
</telerik:RadSplitter>
<asp:HiddenField ID="HiddenFieldPageNumber" runat="server" Value="1" />
<asp:HiddenField ID="HiddenFieldPageTotal" runat="server" Value="1" />

So When I click on the RadToolBarButton the ajax Postback is well fired, the second times is a not an ajax postback it's a simple postback, the RadAjaxManager is not on ajaxrequest, and my usercontrols disappear.

Could you help me?

[Pavlina]

Hello Stephane,

Please revise the following help topic and online example which elaborate on Loading UserControls with Ajax. I hope this information will be useful for you.

All the best,
Pavlina
the Telerik team

[Stephane]

Ok I will try your issue.
Thanks.

Best regards,
Stéphane.

[Bruno]

Hi Stephane, 

I am dealing with the same issue. Any luck on the links?

Regards, Tks
Bruno

[Pavlina]

Hello Bruno,

Could you please open a formal support ticket and send us a sample project, illustrating the issue you are facing? We will debug it locally and turn back to you with a solution.

Best wishes,
Pavlina
the Telerik team