z-index starts at 0 when open new stack. Closes #49
z-index starts at 0 when open new stack. Closes #49

fzadow/CATMAID,htem/CATMAID,htem/CATMAID,fzadow/CATMAID,fzadow/CATMAID,htem/CATMAID,fzadow/CATMAID,htem/CATMAID