I have been working with dialogs in ArmedAssault using different types of controls.
Having a look at the bin.pbo - there is the RscTree included which should be a treeview control (which was used in the VBS2 video of the realtime editor).
Unfortunatly I could not find any hint yet if it is possible to use the RSCTree in ArmA and how it works.
Has anybody tried to get it work or some input on that - would be appreciated very much as that control could optimize ArmA dialogs a lot.