diff --git a/calendar/inc/class.calendar_ui.inc.php b/calendar/inc/class.calendar_ui.inc.php
index d792cc828f..85048f33f5 100644
--- a/calendar/inc/class.calendar_ui.inc.php
+++ b/calendar/inc/class.calendar_ui.inc.php
@@ -179,10 +179,10 @@ class calendar_ui
 	 *
 	 * @return boolean/string false if there's no error or string with error-message
 	 */
-	function check_owners_access()
+	function check_owners_access($users = null, &$no_access = array())
 	{
 		$no_access = $no_access_group = array();
-		$owner_array = explode(',',$this->owner);
+		$owner_array = $users ? $users : explode(',',$this->owner);
 		foreach($owner_array as $idx => $owner)
 		{
 			$owner = trim($owner);
@@ -205,8 +205,10 @@ class calendar_ui
 		}
 		if (count($no_access))
 		{
-			egw_framework::message(lang('Access denied to the calendar of %1 !!!',implode(', ',$no_access)),'error');
+			$message = lang('Access denied to the calendar of %1 !!!',implode(', ',$no_access));
+			egw_framework::message($message,'error');
 			$this->owner = implode(',',$owner_array);
+			return $message;
 		}
 		if (count($no_access_group))
 		{
diff --git a/calendar/inc/class.calendar_uilist.inc.php b/calendar/inc/class.calendar_uilist.inc.php
index 2e55680df6..977559560e 100644
--- a/calendar/inc/class.calendar_uilist.inc.php
+++ b/calendar/inc/class.calendar_uilist.inc.php
@@ -480,9 +480,15 @@ class calendar_uilist extends calendar_ui
 
 		$wv=0;
 		$dv=0;
-		
+
 		// Add in some select options
 		$users = is_array($search_params['users']) ? $search_params['users'] : explode(',',$search_params['users']);
+
+		if($message = $this->check_owners_access($users,$no_access))
+		{
+			egw_json_response::get()->error($message);
+		}
+		
 		foreach($users as $owner)
 		{
 			if(!is_int($owner) && $this->bo->resources[$owner[0]])
diff --git a/calendar/js/app.js b/calendar/js/app.js
index d3e1c58134..3baf590144 100644
--- a/calendar/js/app.js
+++ b/calendar/js/app.js
@@ -199,6 +199,9 @@ app.classes.calendar = AppJS.extend(
 	 *
 	 * App is responsible for only reacting to "messages" it is interested in!
 	 *
+	 * Calendar binds listeners to the data cache, so if the data is updated, the widget
+	 * will automatically update itself.  
+	 *
 	 * @param {string} _msg message (already translated) to show, eg. 'Entry deleted'
 	 * @param {string} _app application name
 	 * @param {(string|number)} _id id of entry to refresh or null