Collapsible Treeview for trade interface

[Kaballah]

It would be great to not have to drag over every single T-shirt and tribal wear when selling them, and instead just collapse the entire branch "t-shirts" and sell them all with one drag instead.  Since the game UI controls already includes treeviews (e.g. on the various workbench ingredient views) maybe this wouldn't be a big deal to add.  Thanks!

[akiceabear]

Yes. Or really any thing to make bulk selling easier!