RubyMine icon in gnome-do

Hi guys,
the problem is in follow:
when i run rubymine(96.1146) in my docky(which installed as part of gnome-do) it always using ugly png icon. I associated .svg icon in my link(Settings->Main Menu) but that doesn't work for me. I guess it's my newb linux problem, but i will be very glad if u give me a hint. Thanks

P.S. yes i googled it :)