class AbstractTypeExtension implements FormTypeExtensionInterface 
Methods
   buildForm(FormBuilderInterface $builder, array $options) Builds the form.  
   buildView(FormView $view, FormInterface $form, array $options) Builds the view.  
   finishView(FormView $view, FormInterface $form, array $options) Finishes the view.  
   configureOptions(OptionsResolver $resolver) Configures the options for this type.  
Details
                        
    buildForm(FormBuilderInterface $builder, arra