The rtl_mlistbox changes significantly in the release 3.0.

The rtl_mlistbox implements the Tk listbox interface and thus can be used as an internal »listtype« listbox inside of another rtl_mlistbox. The ensuing design are cascading listboxes. The level of encapsulated rtl_mlistboxes is unlimited.

New Manual Pages were added to this book. The Manual Pages features Scaleable Vector Graphics screen-shots such as: Figure A.2, “rtl_mlistbox using hugelist”.