Touch screen left click long press

Hi,

I've got a Microsoft Surface that use Tightvnc to control screen (PV7) remotly. Everything work perfect exept one thing: jog function. When we press and hold a jog button, nothing append. Once we release the button, machine jog for a very short period. It's look like the screen handle touch like a mouse up event. If I use a mouse instead of touch, it's work, so this is not a panelview / plc issue.  Any idea?

Please don't tell me to disable right click on long press in windows menu, I already did this since day 1. This is not my issue.

thanks for your help