extjs-gpl/examples/classic/neptune-components/app/view/form/widget/CollapsibleFieldset.js

GPL licensed version of Sencha Ext JS

Ext.define('Neptune.view.form.widget.CollapsibleFieldset', {
    extend: 'Neptune.view.form.widget.Fieldset',
    xtype: 'collapsibleFieldset',
    collapsible: true
});