i am using clarion for windows 5 and i have worked on tree control.. i think first you should define you files and their one to many relationship in the data dictionary and then in you app you should use list box in tree view and rest you will find it on the properties screen which will help you ... if you find any problem let me know.

I have not tried upto 29 levels but the way to do it i.e. if you do not want to do it manually is to create ALIAS files and relate the files i.e. something like Original File --> Alias 1 --> Alias 2 --> Alias 3 etc etc. Theoretically, it should work for 29 levels. If Trees are a important part of your application why don't you check out UltraTree Platinum (www.ultratree.com) which handles recursive relationships and allows excellent formatting of the Tree. There was also some article in the Clarion Magazine (www.clarionmag.com) recently about Tree Browses.