A DropDownButton can nearly be used like a standard Swing button. This is because a DropDownButton extends JButton. Additional methods are documented in the Synthetica Addons API.

Generally default arrow icons will be provided by the active Synthetica Look and Feel. You can choose to use a bigger or smaller arrow icon. It is also possible to set a custom arrow icon.

All relevant lines are highlighted. Press the "Run..." button to start the example.