The actual GUI is always a bean customizer: if the bean descriptor provides one, it will be used; otherwise, a GenericTestBeanCustomizer will be created for this purpose.
Those customizers deviate from the standards only in that, instead of a bean, they will receive a Map in the setObject call. This will be a property name to value Map. The customizer is also in charge of initializing empty Maps with sensible initial values.
If the provided Customizer class implements the SharedCustomizer interface, the same instance of the customizer will be reused for all beans of the type: setObject(map) can then be called multiple times. Otherwise, one separate instance will be used for each element. For efficiency reasons, most customizers should implement SharedCustomizer.
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