def ad_group(name = nil, &block)
      save
      ad_group = AdGroup.new(self, name, &block)
      ad_group.save
      @ad_groups ||= []
      @ad_groups.push(ad_group)
      ad_group
    end
def ad_group(name = nil, &block)
      save
      ad_group = AdGroup.new(self, name, &block)
      ad_group.save
      @ad_groups ||= []
      @ad_groups.push(ad_group)
      ad_group
    end
ad_group management