//Customize prototype & template
http://stackoverflow.com/questions/7555702/how-to-customize-the-data-prototype-attribute-in-symfony-2-forms
http://toni.uebernickel.info/2012/03/15/an-example-of-symfony2-collectiontype-form-field-prototype.html

//customize request
http://www.developpez.net/forums/d1264028/php/bibliotheques-frameworks/symfony/symfony2/form-realiser-simple-formulaire-entity-field-type/
http://stackoverflow.com/questions/8456298/custom-query-in-entity-field-type

http://stackoverflow.com/questions/15199784/symfony2-passing-values-to-collection-form-type

http://stackoverflow.com/questions/11999745/how-to-set-up-default-value-in-symfony2-select-box-with-data-from-database/12000289#12000289

//nested form prototypes
http://stackoverflow.com/questions/16487129/symfony2-multiple-nested-forms-prototype
https://www.youtube.com/watch?v=RVvRNlhpIaQ


Controller et FormItem
http://symfony.com/doc/current/reference/forms/types/collection.html#by-reference


Override :
Pour Entité : nécessite une mapped-superclass
Sinon, c'est impossible :(
https://github.com/symfony/symfony-docs/issues/735
http://blog.nicolashachet.com/niveaux/confirme/surcharger-vos-entites-doctrine-en-symfony-2-exemple-avec-le-fosuserbundle/

CPASimUSanteItemSelectorBundle.php
public function getParent()
{
    return 'ClarolineCoreBundle';
}

    {#
    //http://stackoverflow.com/questions/3982422/full-screen-iframe #}