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);
 }