Fixed Issue 22:  	 Add operation tree expand
Fixed Issue 22:  	 Add operation tree expand
satovey/heekscnc,asmuelle/heekscnc,satovey/heekscnc,jihyun-kim/heekscnc,asmuelle/heekscnc,satovey/heekscnc,jihyun-kim/heekscnc,asmuelle/heekscnc,jihyun-kim/heekscnc,satovey/heekscnc,asmuelle/heekscnc,jihyun-kim/heekscnc