AddToolTip Method

        this.tooltipServiceWrapper.addTooltip(chart.selectAll('.bar'),
        (datapoint:unknown)=> Visual.getTooltipData(0),
        null);

I successfully display a 'static' tooltip as a PoC, by not using a selectorId, and hard passing 0, and passing static values back (for now):

    private static getTooltipData(value: any): VisualTooltipDataItem[] {
        return [{
            displayName: "test",//value.category,
            value: "55"//value.value.toString()//,
            // color: value.color,
            // header: "display"
        }];
    }

This should prove everything else is set up correctly, My question is, whenever i try to use real dynamic data, the tooltop disapears and i can't seem to see anything wrong. I noticed the documentation is wrong (the example they show would not work, use my example instead) and missing (clicking link on this page shows 404)..

But browing the source: It looks like i need to create a custom interface, and then manually push the array w/ my data? And generate a selecitonID?

Is there any documentation going over all of that? thanks,