[HELP]Make NPC Static

Hello..
I need some help here on how to make my npc doesn't change the direction when players click on the npc..means the npc stay static with 1 direction although players click on them.i try to make it in npc file in ini folder but it doesn't work..anyone have an idea or guideline about this..please share..thank.

Under npc.ini for certain NPC add in the end line:
ChangeDir=0

for example:

Cheers