Want to grow a Tree?
Some programmers don’t like Microsoft controls, in this case you can look at other solutions – for example VBAccelerator.com offers some.
Other programmers don’t like ActiveX controls, but still there are some solutions for Treeview. For example SmartTree: Native Access Treeview Functionality by Lauren Quantrell – looks quite interesting. There is a sample download of this solution. Other solutions you can find at M&P page.
What about WEB? Now you can find a lot of staff for ASP/ASP.NET. Long ago I used Java Treeview, same you could see at MSDN Library page several years ago. Recently I used one from Obout Inc., and now I mostly use R.A.D. Treeview from Telerik. Well done control with AJAX loading on demand and good client API.