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User can change position of items in a Palette category. User can use "Order by Item Name" action from popup menu, but after this, there is no way back. There is no something like "Custom order", "Order by importance" or "Order by Netbeans guys". User can only reset ALL CATEGORIES AT ONCE in Palette manager, and this is very user unfriendly.
Seems more like a request for enhancement than a defect.