Startup application launches incorrect icon in launcher

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http://askubuntu.com – I installed Nixnote on Ubuntu 12.04, locked the icon to my launcher, and set a custom icon via /usr/share/applications/nixnote.desktop. When I copy nixnote.desktop to ~/.config/autostart/, Nixnote shows up in my startup applications list with the proper icon. When I log off then log back on, Nixnote launches automatically (as it should). However, it doesn't use the Nixnote icon that is already locked to the launcher - it uses a grainy icon that I am not able to successfully lock to my launcher (if I lock it, it disappears when I close Nixnote). How do I get my startup application (in this (HowTos)