right click menu( no contextmenu for stylus ) problem?

hi all:
am using the device with usb keyboard and usb mouse,
also with the touchpanel. All of them can work.
The problem is:
when click stylus down for long enough time,there is no contextmenu
created.
But with the usb mouse, when click the left mouse down for a long time, it
can display
the contextmenul. why dont do this for stylus?

when click stylus down for a long time, it can see ce is drawing the a
lot of small
track rectangle around the click point.





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