The often-confusing nvis parameter was removed from the FXTreeListBox constructor. If you desire a non-zero number of visible items, set this by calling the setNumVisible() member function after the tree list box is constructed.

Added the sortRootItems() member function to the FXTreeListBox class, for sorting all of the root-level items in the tree list box. The behavior of the previously available sortItems() member function has been changed so that it recursively sorts all of the items in the tree list box.