Hello Martin, I would like to extend wicket-bootstrap and add addition option: https://getdatepicker.com/4/Options/#parseinputdate
the value should be "reference to function" or "inline function definition" Is there any option to add IKey https://github.com/l0rdn1kk0n/wicket-bootstrap/blob/wicket-9.x-bootstrap-4.x/bootstrap-extensions/src/main/java/de/agilecoders/wicket/extensions/markup/html/bootstrap/form/datetime/DatetimePickerConfig.java#L78 so it's value wouldn't be escaped? I already tried String, IFunction and org.apache.wicket.ajax.json.JSONFunction Shall I create a new class or maybe there is one I'm not aware of? :))) -- Best regards, Maxim