+}
+
+/**
+ * subscribe windowmanager event
+ *
+ * #### Parameters
+ * - api : the api serving the request
+ * - event : windowmanager event
+ *
+ * #### Return
+ * None
+ *
+ */
+void HS_WmProxy::subscribe(afb_api_t api, EventType event)
+{
+ struct json_object* push_obj = json_object_new_object();
+ json_object_object_add(push_obj, _event, json_object_new_int(event));
+ api_call(api, _windowmanager, "wm_subscribe", push_obj);