ComponentFactory.Quicksilver.Layout.MetaElementCollection.Insert C# (CSharp) Method

        public override void Insert(int index, UIElement element)
        {
            if (_isItemsHost)
                base.Insert(index, element);
            else
            {
                ValidateElement(element);
                VerifyWriteAccess();

                // Add to the external list
                _externalChildren.Insert(index, element);

                // Add to internal logical tree
                SetLogicalParent(element);

                // Add to the internal visual tree (in same relative position in the visual collection)
                if (_internalChildren.Count == 0)
                    _internalChildren.Add(element);
                else if (index == 0)
                    _internalChildren.Insert(0, element);
                else
                    _internalChildren.Insert(_internalChildren.IndexOf(_externalChildren[index - 1]) + 1, element);

                // Instruct the visual parent it must measure with the new child element
                _visualParent.InvalidateMeasure();

                // Added event is always generated after the base call
                OnUIElementsAdded(new UIElementsEventArgs(element));
            }
        }