ComponentFactory.Krypton.Ribbon.KryptonRibbonGroupButtonDesigner.UpdateVerbStatus C# (CSharp) Method

        private void UpdateVerbStatus()
        {
            // Create verbs first time around
            if (_verbs == null)
            {
                _verbs = new DesignerVerbCollection();
                _toggleHelpersVerb = new DesignerVerb("Toggle Helpers", new EventHandler(OnToggleHelpers));
                _moveFirstVerb = new DesignerVerb("Move Button First", new EventHandler(OnMoveFirst));
                _movePrevVerb = new DesignerVerb("Move Button Previous", new EventHandler(OnMovePrevious));
                _moveNextVerb = new DesignerVerb("Move Button Next", new EventHandler(OnMoveNext));
                _moveLastVerb = new DesignerVerb("Move Button Last", new EventHandler(OnMoveLast));
                _deleteButtonVerb = new DesignerVerb("Delete Button", new EventHandler(OnDeleteButton));
                _verbs.AddRange(new DesignerVerb[] { _toggleHelpersVerb, _moveFirstVerb, _movePrevVerb,
                                                         _moveNextVerb, _moveLastVerb, _deleteButtonVerb });
            }

            bool moveFirst = false;
            bool movePrev = false;
            bool moveNext = false;
            bool moveLast = false;

            if ((_ribbonButton != null) && (_ribbonButton.Ribbon != null))
            {
                TypedRestrictCollection<KryptonRibbonGroupItem> items = ParentItems;
                moveFirst = (items.IndexOf(_ribbonButton) > 0);
                movePrev = (items.IndexOf(_ribbonButton) > 0);
                moveNext = (items.IndexOf(_ribbonButton) < (items.Count - 1));
                moveLast = (items.IndexOf(_ribbonButton) < (items.Count - 1));
            }

            _moveFirstVerb.Enabled = moveFirst;
            _movePrevVerb.Enabled = movePrev;
            _moveNextVerb.Enabled = moveNext;
            _moveLastVerb.Enabled = moveLast;
        }