public static bool SaveGrammarToXML(RadTreeView tree, string filePath)
 {
     try
     {
         tree.SaveXML(filePath, typeof(GrammarTreeViewTag));
     }
     catch {
         return false;
     }
     return true;
 }
 public static bool SaveGrammarToXML(RadTreeView tree, Stream stream)
 {
     try
     {
         tree.SaveXML(stream, typeof(GrammarTreeViewTag));
     }
     catch
     {
         return false;
     }
     return true;
 }