3 string references to 'Radio'

FormTestDisabledElementsForm::buildForm in core/modules/system/tests/modules/form_test/src/Form/FormTestDisabledElementsForm.php
Form constructor.
Radio::preRenderRadio in core/lib/Drupal/Core/Render/Element/Radio.php
Prepares a #type 'radio' render element for input.html.twig.
RenderElement::preRenderAjaxForm in core/lib/Drupal/Core/Render/Element/RenderElement.php
Adds Ajax information about an element to communicate with JavaScript.

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