Docs can be found at http://incrtcl.sourceforge.net/iwidgets/iwidgets/fileselectionbox.html and http://purl.org/tcl/home/man/iwidgets3.0/fileselectionbox.n.html
See also Tix's http://tix.sourceforge.net/man/html/TixCmd/tixExFileSelectBox.htm
Category Command, a part of incr Widgets
