- * @cfg {String/Number/Button} defaultButton
- * The id / index of a button or a button instance to focus when this window received the focus.
+ * @cfg {String/Number/Component} defaultButton
+ * <p>Specifies a Component to receive focus when this Window is focussed.</p>
+ * <p>This may be one of:</p><div class="mdetail-params"><ul>
+ * <li>The index of a footer Button.</li>
+ * <li>The id of a Component.</li>
+ * <li>A Component.</li>
+ * </ul></div>