I have the same application written in JavaFX 1.3 and now ported to JavaFX 2.0
There's an export to image feature that uses the FileSaveService.
With the JavaFX 1.3-based app when the user clicks 'Export' a FileChooser dialog appears. It has a native look and feel on my win machine.

In the JavaFX 2.0 - based version the same dialog has a swing look and feel...That's strange... It also takes around 4-5 seconds before the dialogs shows up, hanging the VM during that time