A more powerful ILcyCustomizerPanel framework has been introduced
aside of this functionality. Please note that all existing uses of this mechanism, both
adding custom implementations and retrieving implementations added by Lucy addons,
keep on working. It is however strongly recommended to use the ILcyCustomizerPanel
mechanism for new code. Please refer to the Lucy developer's guide or
TLcyUserInterfaceManager.getCompositeCustomizerPanelFactory() for more information
on the new mechanism.