WnckClassGroup
@wnckclassgroup: the object which received the signal.
@wnckclassgroup: the object which received the signal.
@id:
@Returns:
@class_group:
@Returns:
@class_group:
@Returns:
@class_group:
@Returns:
@class_group:
@Returns:
@class_group:
@Returns:
@class_group:
@Returns: