code: func (v *Statusbar) GetContextId(contextDescription string) uint {
  	cstr := C.CString(contextDescription)
  	defer C.free(unsafe.Pointer(cstr))
  	c := C.gtk_statusbar_get_context_id(v.native(), (*C.gchar)(cstr))
  	return uint(c)
  }
docs: // GetContextId() is a wrapper around gtk_statusbar_get_context_id().