code: func (v *EntryBuffer) InsertText(position uint, text string) uint {
  	cstr := C.CString(text)
  	defer C.free(unsafe.Pointer(cstr))
  	c := C.gtk_entry_buffer_insert_text(v.native(), C.guint(position),
  		(*C.gchar)(cstr), C.gint(len(text)))
  	return uint(c)
  }
docs: // InsertText() is a wrapper around gtk_entry_buffer_insert_text().