def method_missing(m, *args, &block)  
        if @tracker_names.include? m
          @tracker_blocks[m] = block
        else
          super(name, *args, &block)
        end
      end
def method_missing(m, *args, &block)  
        if @tracker_names.include? m
          @tracker_blocks[m] = block
        else
          super(name, *args, &block)
        end
      end
store tracker code blocks