ref: 05f6c08985c9bd522e0a938f0e90b20df3f6792d
dir: /sys/src/libcontrol/group.h/
typedef struct Group Group; struct Group { Control; int lastbut; int border; int mansize; /* size was set manually */ int separation; int selected; int lastkid; CImage *bordercolor; CImage *image; int nkids; Control **kids; /* mallocated */ Rectangle *separators; /* mallocated */ int nseparators; };