$htmlForm = Preferences::getFormObject( $this->getUser(), $this->getContext() );
$htmlForm->setSubmitCallback( array( 'Preferences', 'tryUISubmit' ) );
$htmlForm = Preferences::getFormObject( $this->getUser(), $this->getContext() );
$htmlForm->setSubmitCallback( array( 'Preferences', 'tryUISubmit' ) );