let timeline = this.timelineRef.nativeElement;
        
if( ios ) {   

    let position = UITableViewScrollPosition.UITableViewScrollPositionMiddle;
    let animated = false;
    let nsIndex = NSIndexPath.indexPathForItemInSection(index, 0);
    timeline.ios.scrollToRowAtIndexPathAtScrollPositionAnimated(nsIndex, position, animated);

} else( android ) {

    let itemHeight = timeline.android.getChildAt(index).getHeight(); 
    let offset = timeline.android.getHeight() / 2 - itemHeight / 2;
    timeline.android.smoothScrollToPositionFromTop(index, offset, 0);

}