Can't get no javascript to execute on an ASP.NET user control

Question

I'm trying to do the simplest thing, to show an alert popup through javascript from my code-behind of a user control (ascx.cs).

I've tried

protected void btnSave_Click(object sender, EventArgs e)
{
    ScriptManager.RegisterStartupScript(btnSave, GetType(), "uniqueID", "alert('hello');", true);
}

as well as

Page.ClientScript.RegisterStartupScript(GetType(), "uniqueID", "alert('hello');", true);

but nothing seems to work for me. The control is located within an RadAjaxPanel (telerik) in an ASPX page.

I'm missing something obvious here. Any ideas what?

EDIT: The javascript is not injected into the html source as far as I can see. I look for the ID and the actual alert statement in the html.

Answer 1

Ah, the problem was the Telerik RadAjaxPanel. I just had to set the EnableOutsideScripts to true on them, like so:

<telerik:RadAjaxPanel ID="ajaxpanel" runat="server" LoadingPanelID="ajaxLoadingPanel" EnableOutsideScripts="true">

And then I could use the following code:

ScriptManager.RegisterStartupScript(btnSave, GetType(), "uniqueID", "alert('hello');", true);