On the Mac we have to deliver events to the applet process across the communications pipe. Unfortunately, when I did the first implementation for AWT-based applets I put the event delivery methods into PluginEmbeddedFrame, so, in effect, the event handling methods currently assume the existence of an AWT-based container frame.

This needs to change so that com.sun.deploy.uitoolkit.Window has methods for receiving the serialized events, which are in turn implemented by FXWindow.