}
@Override
public void initAction() {
final Object obj = interaction.getSpinner();
final ShapeProperties prop;
if(obj==instrument.arrowInset) prop = ShapeProperties.ARROW_INSET;
else if(obj==instrument.arrowLength) prop = ShapeProperties.ARROW_LENGTH;
else if(obj==instrument.arrowSizeDim) prop = ShapeProperties.ARROW_SIZE_DIM;
else if(obj==instrument.arrowSizeNum) prop = ShapeProperties.ARROW_SIZE_NUM;