You will need to provide methods for these S3 generics if you want to create your own guide object. They are currently undocumented; use at your own risk!
guide_train(guide, scale, aesthetic = NULL)
guide_merge(guide, new_guide)
guide_geom(guide, layers, default_mapping)
guide_transform(guide, coord, panel_params)
guide_gengrob(guide, theme)The guide object