In a cell based EUI, existing display container cells nested within a "host" display container cell are automatically shifted and/or downsized, if necessary, to increase available space to facilitate the creation of another display container cell nested within the "host" display container cell, in response to a request to perform the creation. Similar shifting and/or downsizing are performed to facilitate expansion of one of the nested display container cells; and shifting and upsizing are performed to facilitate contraction of one of the nested display container cells. In one embodiment, shifting and/or downsizing/upsizing are performed in view re-sizing priorities of the display container cells and attributes of a host display container cell governing placement and/or alignment of immediately nested display container cells. In one embodiment, an efficient extended boundary method is employed.