protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                document.DocumentAboutToBeChanged -= DocumentAboutToBeChanged;
                if (codeCompletionListView != null)
                {
                    codeCompletionListView.Dispose();
                    codeCompletionListView = null;
                }

                if (declarationViewWindow != null)
                {
                    declarationViewWindow.Dispose();
                    declarationViewWindow = null;
                }
            }

            base.Dispose(disposing);
        }