def nav content = nil, options = {}, html_options = nil, &block
      @items << UiBibz::Ui::Core::Component.new(Nav.new(content, options).tap(&block).render, {}, html_options)
    end
def nav content = nil, options = {}, html_options = nil, &block
      @items << UiBibz::Ui::Core::Component.new(Nav.new(content, options).tap(&block).render, {}, html_options)
    end
Add nav in nav