Top = Input xml (a combo box since that's the only one with this feature hooked in so far)
Bottom = Output xml, this is what it looks like saved (at least before having default values/empty values removed)
Right = Properties of the Combobox
Math can be performed both in the incoming xml, and in the properties grid. I couldn't screen shot the math in the properties grid because it's set to process the math whenever enter is pressed (screen shot triggers it to apparently =/)
This isn't the finished look, just a test app i use before implementing features into the real thing.
Threaded Mode
