Hi, For all libs with dependencies, it's a good idea to make a full group <group name="angular-ui-tree"> with angular dependency. But in some case (global layout...) we need another 'only' group without any dependency. So final wro group should like: <group name="angular-ui-tree-only"> <js/> <css/> </group> <group name="angular-ui-tree"> <group-ref>angular</group> <group-ref>angular-ui-tree-only</group-ref> </group> Regards. -- Éric Chatellier - www.codelutin.com - 02.40.50.29.28