Tested using FX Cont trunk build 130 (Sep 9, 2008 4:49:22 PM) on NB6.5:
Product Version: NetBeans IDE Dev (Build 200809081401)
Java: 1.6.0_10-rc; Java HotSpot(TM) Client VM 11.0-b14
System: Windows Vista version 6.0 running on x86; Cp1252; en_US (nb)


1. Right click a project > Properties
2. Sources is selected
3. run a11y test against it.

 Components not reachable with tab traversal :
   Class: javax.swing.JButton {  Cancel |  N/A }
   Class: javax.swing.JButton {  Help |  Help button }
   Class: javax.swing.JButton {  Includes/Excludes... |  Iinvokes the Configure
Includes & Excludes dialog which allows you to specify the packages you want to
include in your project. }
   Class: javax.swing.JComboBox {  Encoding: |  Encoding determines how the IDE
interprets characters beyond the ASCII character set. }
   Class: javax.swing.JComboBox {  N/A |  N/A }
   Class: org.netbeans.modules.project.uiapi.CustomizerDialog$ListeningButton {
 OK |  N/A }


I manually tested this and the only one that I can't reach is the Encoding JComboBox:

   Class: javax.swing.JComboBox {  Encoding: |  Encoding determines how the IDE
interprets characters beyond the ASCII character set. }