zoom on tablet

I am wanting to install my SN7 Pro on my Windows 8 Pro tablet.  The install worked fine and the program runs fine, however, is there any way to have the screen do a two finger pinch zoom?  I have purchased SkySafari for my Android tablet and love the program.  I would really like to have that program available on the Windows Metro side as I would rather use my laptop with SN7 Pro.