1) Panel item should be ActionSource2
1a) Parameters submission either by f:param/a4j:param should be supported
1b) All Ajax attributes/queues integration is specified at the item's level, not container
1c) Panel items should by default execute panel container by Ajax
2) Panel container should not have Ajax attributes - its only responsibility is control of selection. Items should not query it for Ajax-related items (but may query for another things like panelMenu-wide mode customization).