[CMake] CPack NSIS problem

[Robert Bielik]

I'm trying to get an icon to show in Windows "Programs and features", registry should contain a "DisplayIcon" entry pointing to the icon
to show. But CPack generates only:

  ; Optional registration
  Push "DisplayIcon"
  Push "$INSTDIR\"
  Call ConditionalAddToRegisty

which of course will make "Programs and features" show no icon at all. So the question is, how do I tell CPack to create 
a correct path ?

TIA
/Rob