Thanks for the reply but I dont think those programs do what I want.
I found an excellent website that explains what I'm talking about
: SAP Design Guild -- ighting (with) Hierarchies - Presentation Techniques I
Notice in the first picture, windows can expand folders in the left pane but not display files, and can display files in the right pane with info but cant expand folders.
The second picture, Macintosh Finder, can display both files/details AND expand folders with one pane.
Anyone know what im talking about?