GtkRcStyle that will be looked up by a matching against
the class hierarchy of the widget. This is equivalent to a:
class PATTERN style STYLE
statement in a RC file.
WARNING: gtk_rc_add_class_style is deprecated and should not be used in newly-written code. Use gtkRcParseString with a suitable string instead.
gtkRcAddClassStyle(object, pattern)objectGtkRcStyle to use for widgets deriving from patternpattern