Add tooltip to a custom Visual

Hi Anonymous 

Here is an example code to add tooltips to custom visual. Try it and compare it with your codes.

For reference: Sample code

...   
 private renderTooltip(selection: Selection<Line | Task | MilestonePath>): void {
        this.tooltipServiceWrapper.addTooltip(
            selection,
            (tooltipEvent: TooltipEventArgs<TooltipEnabledDataPoint>) => {
                return tooltipEvent.data.tooltipInfo;
            });
    }
...

Here is a post with similar requirement like yours.

For reference:

Custom Visual Tooltip Data Option

Best Regards,
Rico Zhou

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