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Created attachment 158857 [details] 1
Created attachment 158858 [details] 2
Created attachment 158859 [details] 3 3
Created attachment 158860 [details] 4 4
i found a workaround if i use it like this --> CustomComboBox<T> extends JComboBox<T> the issue will happen but if i use it like this --> CustomComboBox<E> extends JComboBox<E> using E it works like a charm