* @li elm_object_signal_callback_add
* @li elm_object_signal_callback_del
*
+ * Here is some sample code using it:
+ * @li @ref calendar_example_01
+ * @li @ref calendar_example_02
+ * @li @ref calendar_example_03
+ * @li @ref calendar_example_04
+ * @li @ref calendar_example_05
+ * @li @ref calendar_example_06
*/
/**