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An exception occured when cliking on the Palette>Beans>ChooseBeans : I joined the messages.log as suggested in NetBeans IDE.
Created attachment 39827 [details] Fichier de log
java.lang.NullPointerException at org.netbeans.modules.form.palette.PaletteUtils.getSelectedItem(PaletteUtils.java:285) ... Seems already fixed with issue 90438.