Widgets can be named, which allows you to refer to them from a gtkrc file. You can apply a style to widgets with a particular name in the gtkrc file. See the documentation for gtkrc files (on the same page as the docs for Gtk::RcStyle).
Note that widget names are separated by periods in paths (see path()), so names with embedded periods may cause confusion.
Reimplemented in Gtk::AboutDialog.
Referenced by TimeAxisView::build_display_menu(), ImageFrameTimeAxis::build_display_menu(), MarkerTimeAxis::build_marker_menu(), TimeAxisView::build_size_menu(), ImageFrameTimeAxis::create_imageframe_menu(), and VisualTimeAxis::VisualTimeAxis().