private void btnNewActivity_Click(object sender, RoutedEventArgs e)
        {
            Activity newActivity = new Activity();

            newActivity.Name        = ActivityLoader.GetHighestAvailableTemplateActivityString();
            newActivity.Root        = new InventoryItem();
            newActivity.Root.CopyOf = "All Waves";
            try
            {
                ActivitySelectionChanged(newActivity);
            }
            catch (NullReferenceException)
            {
            }
        }