The class ajpHList allows you to use a normal userfrom Listbox in a similar way to a Treeview list.
Where Nodes (listitems) are stored within other Nodes. 
Appropriate Nodes can be opened to reveal related nodes or closed to conceal them.

Opening and closing of Nodes can be done either with double clicks or the Enter key.

The workbook contains a userform that allows you to change the font and alter the characters used to build the nodes and connecting lines.

This workbook contains a version that uses global procedures instead of raising events.

v1.1 12th Jan 2007 - Bug fix handling of last element