function openPage(pageRequest, dir) {

        initViewForItem(pageRequest.spineItem, function(isViewChanged){

            if(!isViewChanged) {
                _currentView.setViewSettings(_viewerSettings);
            }

            _currentView.openPage(pageRequest, dir);
        });
    }
Opens specified page index of the current spine item

@method openPageIndex

@param {number} pageIndex Zero based index of the page in the current spine item
@param {object} initiator optional