I don't believe these commands have been added to our built in apps yet.
So to use them currently you'll need to create three custom commands
startLevelChange("up")
startLevelChange("down")
and stopLevelChange()
As an Example in BC using a two button controller you would then implement the following:
button 1 pushed [light xyz] on
button 1 held [light xyz] startLevelChange("up")
button 1 released [light xyz] stopLevelChange()
for button 2 you go the other direction
button 1 pushed [light xyz] off
button 1 held [light xyz] startLevelChange("down")
button 1 released [light xyz] stopLevelChange()
