Disable ScriptManager programmatically when ScriptManagerProxy controls are present

I've tried following this advice for disabling a ScriptManager programmatically, to no avail: http://stackoverflow.com/questions/1057905/disable-scriptmanager-on-certain-pages

StandardScriptManager.ascx:

<%@ control language="vb" autoeventwireup="false" codebehind="StandardScriptManager.ascx.vb" inherits="StandardScriptManager" %>
<h1>StandardScriptManager is visible</h1>
<asp:scriptmanager id="MyScriptManager" runat="server" enablepartialrendering="true" >
        <scripts>
            <asp:scriptreference path="/Standard/Core/Javascript/script1.js" />
            <!-- etc... -->
        </scripts>
</asp:scriptmanager>

StandardScriptManager.ascx.vb:

Partial Public Class StandardScriptManager
    Inherits System.Web.UI.UserControl

    Private _ScriptManager As ScriptManager

    Private Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
        If DisableAllScripts Then
            Me.Visible = False
        End If
    End Sub

End Class

When DisableAllScripts is true, the <h1> doesn't show up, but the scripts are still added to the page. I suspect this is because I have ScriptManagerProxy objects elsewhere on the page.

I've also tried Me.Controls.Clear() in Page.Init, but I get this

[InvalidOperationException: Page cannot be null. Please ensure that this operation is being performed in the context of an ASP.NET request.]
   System.Web.UI.ScriptManager.get_IPage() +372796
   System.Web.UI.ScriptManager.OnPageInitComplete(Object sender, EventArgs e) +13
   System.Web.UI.Page.OnInitComplete(EventArgs e) +8699478
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +467

It's maddening that there's not a straightforward way to disable the ScriptManager; the control has no Enabled property, and you can't set ScriptManager.Visible=False.

Any ideas?

ansaurus

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Disable ScriptManager programmatically when ScriptManagerProxy controls are present

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