code: protected final void addTagHandler(String name, Class<? extends TagHandler> handlerType)
      {
          _factories.put(name, new HandlerFactory(handlerType));
      }
docs: Use the specified HandlerType in compiling Facelets. HandlerType must extend TagHandler.
  
  @see TagHandler
  @param name
  name to use, "foo" would be &lt;my:foo />
  @param handlerType
  must extend TagHandler