code: function(checkbox, options) {
          this.element = checkbox = $(checkbox);
          options = this.setOptions(options, checkbox);
          this.wrapper = this._buildWrapper();
  
          // Create custom input
          this.input = this.render(options.checkboxTemplate)
              .attr('for', checkbox.attr('id'))
              .insertAfter(checkbox);
  
          // Initialize events
          this.initialize();
      }
docs: Initialize the checkbox.
  
  @param {jQuery} checkbox
  @param {Object} [options]