def html content = nil, &block
      if !block.nil?
        context  = eval("self", block.binding)
        @items << context.capture(&block)
      else
        @items << content
      end
    end
def html content = nil, &block
      if !block.nil?
        context  = eval("self", block.binding)
        @items << context.capture(&block)
      else
        @items << content
      end
    end
Add html component