"Homepage" element changes in XML take no effect.

NetBeans build:
NetBeans IDE 5.0 Beta Build200509261930
JNLP Plug-in build:
12-Oct-2005 11:38:43

Steps :
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1. Create a new Java Application(JavaApplication1) and add some code to the java file.
2. Select this application in Projects View , right click mouse and invoke "Enable Java Web Start" from contextual menu . The default jnlp file will be opened in jnlp editor
3. Switch to "XML" on the editor , make changes on the Homepage element

Switch back to "General" on the editor , the homepage did not change . Changes won't show in jnlp file even after "save" changes.
Same error with "Icon" element