function tab(e) {
			var parentRole = getParentRole();

			if (parentRole == "tablist") {
				var elm = getFocusElements(focusedControl.getEl('body'))[0];

				if (elm) {
					elm.focus();
				}
			} else {
				moveFocus(e.shiftKey ? -1 : 1);
			}
		}
Moves the focus to the next item or previous item depending on shift key.

@private
@param {DOMEvent} e DOM event object.