Comment 6 for bug 387834

Quoting Andreas Nilsson:
""" in gnome-icon-theme trunk, we recently changed the delete icon to a red sign looking like this (/)
 so changing the icon from gtk-remove to gtk-delete in the panel would get the desired effect once we get a release of that out
 and gtk-delete might be a better choice in this situation, as the gtk-remove links to a icon called list-remove
 and nothing is getting removed from a list in this case """