class Page_Controller extends ContentController {
public static $allowed_actions = array(
'guessForm'
);

public function init() {
parent::init();
...
}

public function guessForm() {
$fields = new FieldSet(
new TextField('Content','Any idea yet? Have a guess'),
new HiddenField('OwnerID', 'ID', $this->getPlayer()->ID)
);

$actions = new FieldSet(new FormAction("doSubmitGuess","Submit"));

$validator = new RequiredFields();
$validator->set_javascript_validation_handler('none');

return new Form($this,"guessForm",$fields,$actions,$validator);
}

public function doSubmitGuess($data,$form) {
$guess = new Guess();
$form->saveInto($guess);
$guess->write();

Director::redirectBack();
return;
}
}