augmented reality - Vuforia Smart Terrain Start/Stop/Reset -

i'm getting confused vuforia's smart terrain. here can see methods allow customize smart terrain. start() , stop() methods inherited tracker reset(), startmeshupdates(), stopmeshupdates() aren't available. there shown in link above when open declaration of smartterraintracker in monodevelop, methods missing? wrong? can't reset() smartterrain because th method given undefined.

do have ideas problem , how fix it? in advance!

edit

i have simple c# script, attached smartterrain prefab (the one, created when enable smartterrain on imagetarget). monobehaviour extended in class , vuforia library used - using vuforia;

smartterraintracker instance in example provided in reference above - this.mtracker = trackermanager.instance.gettracker<smartterraintracker>();

still no such methods startmeshupdates() , reset() available.