Containers, agents and smart adornments may be sorted on an attribute's value, i.e. other than in default order, and additionally apply a transform before sorting string attributes. In a normal container the default order will be static and the order in which its children were created (or subsequently manually re-ordered). For agents and smart adornments, the default is less obvious as it depends on the complexity of the query; for trivial examples it usually equates to outline order.
The sort attribute and transform type are selected from pop-up menus on the Sort sub-tab of the Action Inspector.