'Snap image' mode -temporary hide

[Radi]

Hi :-) Im new here and really I now addicted to wings3D :-) Im a mapper for old Unreal Tournament game and found this app almost cant be better for my tasks :-)

Now I have a question about 'snap image' mode, this is great for texturing work. However, when I exit snap mode to see clearly changes I made, and use snap image again, then previous scaling values are lost and this is very annoying.
It is a way to temporary hide snapped image? Tried with second viewport but snapped image is there too.. :-) hope someone helps me with that.
Cheers.