Menus en click derecho de Gkt sharp

Pues resulta que en gtk los menús no aparecen cuando se da click derecho, afortunadamente Dave Glick ha publicado esta clase para solucionarlo.
Les incluyo el código ligeramente modificado si no quieren navegar a otra pagina:

using System;

using Gdk;

using GLib;

using Gtk;

namespace Somedave {

    public class ContextMenuEventArgs: EventArgs {

        private Widget widget;

        public Widget Widget { get { return widget; } }

        private bool rightClick;

        public bool RightClick { get { return rightClick; } }

        public ContextMenuEventArgs(Widget widget, bool rightClick) {

            this.widget = widget;

            this.rightClick = rightClick;

        }

    }

    public class ContextMenuHelper {

        public event EventHandler<ContextMenuEventArgs> ContextMenu;

        public ContextMenuHelper() { }

        public ContextMenuHelper(Widget widget) {

            AttachToWidget(widget);

        }

        public ContextMenuHelper(Widget widget, EventHandler<ContextMenuEventArgs> handler) {

            AttachToWidget(widget);

            ContextMenu += handler;

        }

        public void AttachToWidget(Widget widget) {

            widget.PopupMenu += Widget_PopupMenu;

            widget.ButtonPressEvent += Widget_ButtonPressEvent;

        }

        public void DetachFromWidget(Widget widget) {

            widget.PopupMenu -= Widget_PopupMenu;

            widget.ButtonPressEvent -= Widget_ButtonPressEvent;

        }

        [GLib.ConnectBefore]

        private void Widget_PopupMenu(object o, PopupMenuArgs args) {

            RaiseContextMenuEvent(args, (Widget)o, false);

        }

        [GLib.ConnectBefore]

        private void Widget_ButtonPressEvent(object o, ButtonPressEventArgs args) {

            if(args.Event.Button == 3 && args.Event.Type == EventType.ButtonPress) {

                RaiseContextMenuEvent(args, (Widget)o, true);

            }

        }

        private bool propagating = false;   //Prevent reentry

        private void RaiseContextMenuEvent(SignalArgs signalArgs, Widget widget, bool rightClick) {

            if(!propagating) {

                //Propagate the event

                Event evnt = Gtk.Global.CurrentEvent;

                propagating = true;

                Gtk.Global.PropagateEvent(widget, evnt);

                propagating = false;

                signalArgs.RetVal = true;     //The widget already processed the event in the propagation

                //Raise the context menu event

                ContextMenuEventArgs args = new ContextMenuEventArgs(widget, rightClick);

                if(ContextMenu != null) {

                    ContextMenu.Invoke(this, args);

                }

            }

        }

    }

}