edgesCheckbox.setSelected(spawnShapeValue.isEdges());
sideCombo.setSelectedItem(spawnShapeValue.getShape());
shapeCombo.addActionListener(new ActionListener() {
public void actionPerformed (ActionEvent event) {
SpawnShape shape = (SpawnShape)shapeCombo.getSelectedItem();
spawnShapeValue.setShape(shape);
switch (shape) {
case line:
case square:
setEdgesVisible(false);