Sliders and other stuff

 Couple of questions:

- Can labels and/or tick marks be placed on sliders?
- Can 2D objects be in 3D windows (I'm guessing no)? Would like to mark references within the 3D space.


Doing a simple model of a PN junction, want to show how the depletion region grows and shrines with applied bias voltage. It's working, but would like to polish it a bit. 

First attempt was using the 2D rectangle, but couldn't get the slider to change the width of the rectangle. Making the object a box worked just fine.

Thanks,
-d
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