/// <summary>
        /// This is called when this view becomes the "active" view
        /// </summary>
        protected override void OnActivate()
        {
            if (IsBevShowing)
            {
                BirdsEyeViewModel.SetActiveViewModel(this);
            }
            if (TaxonomyViewModel != null)
            {
                TaxonomyViewModel.SetActiveViewModel(this);
            }

            // Replace any open taxonomy view with our new data
            SendMessage(AlignmentViewMessages.SwitchAlignmentView, this);
            base.OnActivate();
        }
        /// <summary>
        /// This turns the Birds-Eye-Viewer on and off
        /// </summary>
        private void OnShowBev()
        {
            IsBevShowing = !IsBevShowing;
            BirdsEyeViewModel bev = BirdsEyeViewModel;

            if (IsBevShowing)
            {
                bev.Show();
                bev.SetActiveViewModel(this);
            }
            else
            {
                bev.CloseView.Execute(null);
            }
        }