private void OnNavigationBarRightClicked(object sender, EventArgs args)
        {
            var duration = TimeSpan.Zero;

            var entered = durationView.EnteredDuration;

            if (model == null || model.State == TimeEntryState.New)
            {
                duration = new TimeSpan(entered.Hours, entered.Minutes, 0);
            }
            else
            {
                duration = model.GetDuration();
                // Keep the current seconds and milliseconds
                duration = new TimeSpan(0, entered.Hours, entered.Minutes, duration.Seconds, duration.Milliseconds);
            }

            if (model == null)
            {
                var m          = TimeEntryModel.CreateFinished(duration);
                var controller = new EditTimeEntryViewController(m);

                // Replace self with edit controller on the stack
                var vcs = NavigationController.ViewControllers;
                vcs [vcs.Length - 1] = controller;
                NavigationController.SetViewControllers(vcs, true);
            }
            else
            {
                model.SetDuration(duration);
                NavigationController.PopViewControllerAnimated(true);
            }
        }