fnFocusCallback = function () {
						if (this._getTabStrip()._oItemNavigation) {
							this._getTabStrip()._oItemNavigation.focusItem(iNextIndex);
						}
					}
Calculates the next item to be focused and selected and applies the focus and selection when an item is removed.

@param {boolean} bSetAsSelected Whether the next item to be selected
@private