Rajesh, have you seen touchpad horizontal scroll working in LV?
The scroll works in other programs - the drivers are installed. In LV help it works.
I think, LV handles mouse on front panel and block diagram at a lower level. Touchpad scrolling starts as mouse down (light touch (tap) is mouse down) and it is not processed, that touch may become a scroll. It can become a double click - it is handled. Try processing double click as an event. First it gives you single mouse down (not a double click), then a second mouse down with double click flag true.
I am not aware of internal LV functionality, but some of the forum members may be, they can at least agree or disagree (with arguments) with the above conclusion.
If I am right, the scroll is not supported and will not be supported for a long time.
Or I may be wrong, then I need an example: Minimum: "it works". Better: "solved this that way"