$ gdbus call --session --dest com.canonical.indicator.messages --object-path /com/canonical/indicator/messages/phone_greeter --method org.gtk.Menus.Start "[0,1,2]"
([(uint32 0, uint32 0, [{'action': <'indicator.messages'>, 'action-namespace': <'indicator'>, 'x-canonical-type': <'com.canonical.indicator.root'>, ':submenu': <(uint32 1, uint32 0)>}]), (1, 0, [{':section': <(uint32 1, uint32 1)>}, {':section': <(uint32 1, uint32 2)>}, {':section': <(uint32 1, uint32 3)>}]), (1, 1, [{'target': <true>, 'x-canonical-time': <int64 1437142061000000>, 'x-canonical-type': <'com.canonical.indicator.messages.messageitem'>, 'x-canonical-app-icon': <('file', <'file:///custom/click/.click/users/@all/com.ubuntu.developer.webapps.webapp-twitter/twitter.png'>)>, 'x-canonical-message-id': <'4367fcf9-2de69c-2d4ee0-2da6e7-2dc7bdfcaba3f4'>, 'label': <'yes'>, 'icon': <('themed', <['']>)>, 'action': <'com_ubuntu_developer_webapps_webapp-twitter_webapp-twitter_1_1.msg.4367fcf9-2de69c-2d4ee0-2da6e7-2dc7bdfcaba3f4'>}]), (1, 3, [{'action': <'remove-all'>, 'label': <'Tout effacer'>, 'x-canonical-type': <'com.canonical.indicator.button'>}])],)