+ * Supported elm_object common APIs.
+ * @li @ref elm_object_signal_emit
+ * @li @ref elm_object_signal_callback_add
+ * @li @ref elm_object_signal_callback_del
+ * @li @ref elm_object_part_content_set
+ * @li @ref elm_object_part_content_get
+ * @li @ref elm_object_part_content_unset
+ *