protected function _render()
 {
     parent::_render();
     $this->add_attr('min', $this->min);
     $this->add_attr('max', $this->max);
     $this->add_attr('step', $this->step);
     $this->closeTag(false);
 }
 protected function _render()
 {
     parent::_render();
     $this->closeTag(false);
 }
 protected function _render()
 {
     parent::_render();
     $this->add_attr('checked', $this->checked);
     $this->closeTag(false);
 }