Update lib.php

Setup navigation items (by Scott Karren)
Override function can_hide_show_instance(). (by ewallah)

lib.php

@@ -137,6 +137,49 @@ class enrol_apply_plugin extends enrol_plugin {
 		return $icons;
 	}
 
+       /**
+ 	* Is it possible to hide/show enrol instance via standard UI?
+ 	*
+ 	* @param stdClass $instance
+ 	* @return bool
+ 	*/
+	public function can_hide_show_instance($instance) {
+    		$context = context_course::instance($instance->courseid);
+    		return has_capability('enrol/apply:config', $context);
+	}
+	
+	/**
+ 	* Is it possible to delete enrol instance via standard UI?
+ 	*
+ 	* @param stdClass $instance
+ 	* @return bool
+ 	*/
+ 	
+	public function can_delete_instance($instance) {
+    		$context = context_course::instance($instance->courseid);
+    		return has_capability('enrol/apply:config', $context);
+	}
+	
+	
+	/**
+     	* Sets up navigation entries.
+     	*
+     	* @param stdClass $instancesnode
+     	* @param stdClass $instance
+     	* @return void
+     	*/
+    	public function add_course_navigation($instancesnode, stdClass $instance) {
+        if ($instance->enrol !== 'apply') {
+             throw new coding_exception('Invalid enrol instance type!');
+        }
+
+        $context = context_course::instance($instance->courseid);
+        if (has_capability('enrol/apply:config', $context)) {
+            $managelink = new moodle_url('/enrol/apply/edit.php', array('courseid'=>$instance->courseid, 'id'=>$instance->id));
+            $instancesnode->add($this->get_instance_name($instance), $managelink, navigation_node::TYPE_SETTING);
+        }
+    }
+
 	public function get_user_enrolment_actions(course_enrolment_manager $manager, $ue) {
 		$actions = array();
 		$context = $manager->get_context();