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Issue with RadScriptManager at page in RadWindow.

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Andrew asked on 19 Aug 2010, 10:46 AM
Hello, i show RadWindow from parent form:

<telerik:RadTreeView ID="tvFile" runat="server">
        <telerik:RadTreeViewContextMenu ID="MainContextMenu" runat="server">
                 <telerik:RadMenuItem Value="Rights" Text="Rights"/>
    <telerik:RadWindowManager ID="winManager" ShowContentDuringLoad="false" VisibleStatusbar="false"
        ReloadOnShow="false" runat="server" Skin="Sunset" EnableShadow="true">
            <telerik:RadWindow ID="RadWindow2" Modal="true" onClientClose="OnClientClose"
            NavigateUrl="UserRights.aspx" runat="server" Behaviors="Close">
<script type="text/javascript">
    function OnClientClose(oWnd, args)
        var arg = args.get_argument();
        if (arg)
    function openWin(path) {
        var oWnd = radopen("UserRights.aspx?file="+path, "RadWindow2");
    function onClientContextMenuItemClicking(sender, args)
        var menuItem = args.get_menuItem();
        var treeNode = args.get_node();
        var nodeValue = treeNode.get_value();
        switch (menuItem.get_value())
            case "Rights":

At UserRights.aspx I need RadScriptManager for RadListBox like this:

<form id="form1" runat="server">
       <telerik:RadScriptManager ID="RadScriptManager1" runat="server"/>
        <asp:Button runat="server" ID="ds" Text="fd" />
        <telerik:RadListBox runat="server" ID="dcs"></telerik:RadListBox>

But when RadWindow opens at my firebug I got js error:

this._form is null

When I haven't got RadScriptManager all is OK. But I need it for RadListBox and UpdatePanel features.

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Georgi Tunev
Telerik team
answered on 20 Aug 2010, 01:27 PM
Hi Andrew,

I tried to reproduce the problem locally but everything worked as expected, so at this point I cannot tell what might be the reason for this behavior. What happens when:
  1. you open the content page directly in the browser?
  2. you open the content page in a standard IFRAME?

If the problem does not exist in these 2 cases, try setting ShowContentDuringLoad to true for the RadWindow and check your app again.

Georgi Tunev
the Telerik team
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Georgi Tunev
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