catch_element: function(selector, callback) {
      $(selector).each(function(key, element) {
        callback.call(me, $(element))
      })

      $(document).on('DOMNodeInserted', function(e) {
        var selected = $(selector, e.target)
        if (selected.length)
          selected.each(function(key, element) {
            callback.call(me, $(element))
          })
      })
    },