code: func (v *ComboBoxText) GetActiveText() string {
  	c := (*C.char)(C.gtk_combo_box_text_get_active_text(v.native()))
  	defer C.free(unsafe.Pointer(c))
  	return C.GoString(c)
  }
docs: // GetActiveText is a wrapper around gtk_combo_box_text_get_active_text().