Create RadAjaxManager in codebehind

[Eric]

Hi,

Is it possible to create RadAjaxManager in codebehind?

I have a master page and I am creating a RadAjaxManager in the OnInit method of the master page. Later when I try to ajaxify a control within an aspx page using the AddAjaxSettings method I created in master page I get Object reference not set to an instance of an object.

Master Page

protected override void OnInit(EventArgs e)
{
HtmlForm form = (HtmlForm)this.Controls[3];
form.Controls.Add(new RadAjaxManager());
}

public void AddAjaxSetting(Control ajaxified, Control updated, RadAjaxLoadingPanel loading)
{
HtmlForm form = (HtmlForm)this.Controls[3];
RadAjaxManager ajax = form.Controls[1] as RadAjaxManager;
ajax.AjaxSettings.AddAjaxSetting(ajaxified, updated, loading);
}

ASPX page

protected void Page_Load(object sender, EventArgs e)
{
    (this.Master as PortalMaster).AddAjaxSetting(button, panel, loading);
}

Edit: I get the null reference error in ajax.AjaxSettings.AddAjaxSetting(ajaxified, updated, loading); line. All variables are pointing to correct objects (ajax, button, panel, loading).

Thank you...

[Eric]

Solved. I had to add a scriptmanager before adding an ajax manager.

form.Controls.Add(new RadScriptManager());
form.Controls.Add(new RadAjaxManager());

Thank you...