Pressing both mouse buttons triggers two MOUSE_PRESSED events.

On Windows the second MOUSE_PRESSED has primaryButtonDown + secondaryButtonDown flags set.

MouseEvent [source = GlassPane[id=glassPane], target = GlassPane[id=glassPane], eventType = MOUSE_PRESSED, consumed = false, x = 302.0, y = 205.0, button = PRIMARY, primaryButtonDown]
MouseEvent [source = GlassPane[id=glassPane], target = GlassPane[id=glassPane], eventType = MOUSE_PRESSED, consumed = false, x = 302.0, y = 205.0, button = SECONDARY, primaryButtonDown, secondaryButtonDown]

On Mac, the second MOUSE_PRESSED has secondaryButtonDown flag only.

MouseEvent [source = GlassPane[id=glassPane], target = GlassPane[id=glassPane], eventType = MOUSE_PRESSED, consumed = false, x = 358.0, y = 174.0, button = PRIMARY, primaryButtonDown]
MouseEvent [source = GlassPane[id=glassPane], target = GlassPane[id=glassPane], eventType = MOUSE_PRESSED, consumed = false, x = 358.0, y = 174.0, button = SECONDARY, secondaryButtonDown]

This is a bug on Mac : primaryButtonDown flag should be present since both buttons are down.

I use the following SDK build:

$ more timestamp
Product: javafx-2.0.2beta
Platform: macosx-universal
Build-Number: 34
Build-ID: 2011-10-25_17-41-55