fixed https://code.google.com/p/heekscnc/issues/detail?id=358
fixed https://code.google.com/p/heekscnc/issues/detail?id=358
Funcan/heekscad,Funcan/heekscad,satovey/heekscad,satovey/heekscad,haiqiangwang/heekscad,Funcan/heekscad,satovey/heekscad,Funcan/heekscad,satovey/heekscad,haiqiangwang/heekscad,haiqiangwang/heekscad,haiqiangwang/heekscad