SendAlertsManager.cs

public class SendAlertsManager : UserControl
    {

        #region Control Lifecycle

        protected override void OnLoad(EventArgs e)
        {
            if (IsAlertNewPage || IsAlertEditPage)
            {
                EnableSendAlertsToSPGroup();
                Visible = true;
                
            }
            else
            {
                Visible = false;
            }
            
        }


        private void EnableSendAlertsToSPGroup()
        {
            var pe = FindControl<PeopleEditor>(Page.Controls);
            if(pe!= null)
            {
                if(!pe.SelectionSet.Contains("SPGroup"))
                {
                    pe.SelectionSet += ",SPGroup";
                    //pe.AfterCallbackClientScript = "expandGroupCallback";
                }
            }
        }


        protected override void OnPreRender(EventArgs e)
        {
            EnableSendAlertsToSPGroup();
            base.OnPreRender(e);
        }


        #endregion


        #region Control Utilities

        /// <summary>
        /// Find control recursivelly 
        /// (http://weblogs.asp.net/eporter/archive/2007/02/24/asp-net-findcontrol-recursive-with-generics.aspx)
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="controls"></param>
        /// <returns></returns>
        public static T FindControl<T>(System.Web.UI.ControlCollection controls) where T : class
        {
            T found = default(T);

            if (controls != null && controls.Count > 0)
            {
                for (int i = 0; i < controls.Count; i++)
                {
                    if (found != null) break;
                    if (controls[i] is T)
                    {
                        found = controls[i] as T;
                        break;
                    }
                    found = FindControl<T>(controls[i].Controls);
                }
            }

            return found;
        }


        #endregion



        #region Properties

        private bool IsAlertNewPage
        {
            get
            {
                return
                    (Context.Request.Url.PathAndQuery.IndexOf("_layouts/subnew.aspx",
                                                              StringComparison.InvariantCultureIgnoreCase) > 0);
            }
        }

        private bool IsAlertEditPage
        {
            get
            {
                return
                    (Context.Request.Url.PathAndQuery.IndexOf("_layouts/subedit.aspx",
                                                              StringComparison.InvariantCultureIgnoreCase) > 0);
            }
        }



        #endregion
    }