return sprintf("<option value=\"%s\"%s>%s%s %s%s</option>\n",
$this->getId(), $selected, $admin, $this->getNombre(),
$this->getApellido(), $cred);
return sprintf("<option value=\"%s\"%s>%s%s %s%s</option>\n",
$this->getId(), $selected, $admin, $this->getNombre(),
$this->getApellido(), $cred);