Search for a default accessibleName in AquaRadioButton, see #911 and p…

…hetsims/models-of-the-hydrogen-atom#82

js/AquaRadioButton.ts

@@ -13,7 +13,7 @@ import TProperty from '../../axon/js/TProperty.js';
 import InstanceRegistry from '../../phet-core/js/documentation/InstanceRegistry.js';
 import optionize from '../../phet-core/js/optionize.js';
 import StrictOmit from '../../phet-core/js/types/StrictOmit.js';
-import { assertNoAdditionalChildren, Circle, FireListener, isWidthSizable, LayoutConstraint, Node, NodeOptions, Rectangle, SceneryConstants, TPaint, TrimParallelDOMOptions, Voicing, VoicingOptions, WidthSizable } from '../../scenery/js/imports.js';
+import { assertNoAdditionalChildren, Circle, FireListener, isWidthSizable, LayoutConstraint, Node, NodeOptions, PDOMUtils, Rectangle, SceneryConstants, TPaint, TrimParallelDOMOptions, Voicing, VoicingOptions, WidthSizable } from '../../scenery/js/imports.js';
 import multiSelectionSoundPlayerFactory from '../../tambo/js/multiSelectionSoundPlayerFactory.js';
 import TSoundPlayer from '../../tambo/js/TSoundPlayer.js';
 import Tandem from '../../tandem/js/Tandem.js';
@@ -215,6 +215,11 @@ export default class AquaRadioButton<T> extends WidthSizable( Voicing( Node ) )
     };
     property.link( pdomCheckedListener );
 
+    // pdom - If an accessibleName was not provided, search for one in the labelNode
+    if ( !options.accessibleName ) {
+      options.accessibleName = PDOMUtils.findStringProperty( labelNode );
+    }
+
     // pdom - every button in a group of radio buttons should have the same name, see options for more info
     if ( options.a11yNameAttribute !== null ) {
       this.setPDOMAttribute( 'name', options.a11yNameAttribute );