Fixed Issue 22:  	 Add operation tree expand
Fixed Issue 22:  	 Add operation tree expand
dnevels/heekscnc,BbiKkuMi/heekscnc,FluffyMortain/heekscnc,singwina/heekscnc,tbinias/heekscnc,blakelyc/heekscnc,gaziel/heekscnc,tbinias/heekscnc,hackendless/heekscnc,Nurb432/heekscnc,FluffyMortain/heekscnc,elliotf/heekscnc,FluffyMortain/heekscnc,gaziel/heekscnc,BbiKkuMi/heekscnc,elliotf/heekscnc,JamieFBousfield/heekscnc,JamieFBousfield/heekscnc,masika/heekscnc,sangit/heekscnc,singwina/heekscnc,gaziel/heekscnc,BbiKkuMi/heekscnc,pyrotron/heekscnc,tbinias/heekscnc,dnevels/heekscnc,Nurb432/heekscnc,AlanZheng/heekscnc,masika/heekscnc,hackendless/heekscnc,elliotf/heekscnc,sangit/heekscnc,AlanZheng/heekscnc,singwina/heekscnc,JamieFBousfield/heekscnc,hackendless/heekscnc,AlanZheng/heekscnc,Nurb432/heekscnc,tbinias/heekscnc,pyrotron/heekscnc,blakelyc/heekscnc,blakelyc/heekscnc,hackendless/heekscnc,pyrotron/heekscnc,dnevels/heekscnc,pyrotron/heekscnc,masika/heekscnc,masika/heekscnc,singwina/heekscnc,ant-t/heekscnc,sangit/heekscnc,ant-t/heekscnc,blakelyc/heekscnc,Nurb432/heekscnc,AlanZheng/heekscnc,BbiKkuMi/heekscnc,gaziel/heekscnc,JamieFBousfield/heekscnc,ant-t/heekscnc,ant-t/heekscnc,FluffyMortain/heekscnc,sangit/heekscnc,elliotf/heekscnc,dnevels/heekscnc