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When netbeans runs on some LaF menu Preview Desing contains different items: Laf:Nimbus menu items: -Metal -CDE/Motif Laf:Metal menu items: -Metal -Nimbus -CDE/Motif -GTK+ Laf:GTK menu items: -Metal -CDE/Motif GTK+
This is as designed. The current implementation of the preview in another look and feel is just a set of hack that somehow work in some cases (there is not standard/clean way to have two look and feels simultaneously in one Java application). On the other hand, we know that it doesn't work in other cases. For example, we are unable to preview in another SynthLookAndFeel when the IDE is running in some SynthLookAndFeel. GTK and Nimbus are both synth look and feels. Hence, it is not possible to preview in GTK when IDE runs on Nimbus and vice versa.