How to prevent google chrome from creating seprate taskbar icon for each profile?

How to prevent google chrome from creating seprate taskbar icon for each
profile?

I use Google chrome with multiple profiles to test web sites (each profile
has it's own cookies etc). All works fine, but on Windows 8 google will
create a new taskbar icon for each profile, and 10+ chrome icons on
taskbar effectively kills it :(. Since profiles are switched using
profiles top-left menu and additional icond are useless and meaningless -
is it some way to limit chrome to just ONE icon for all profiles? Or
somehow stack all icons into one icon using windows 7/8 "stacking"
mechanism that google uses for multiple icons of one profile?