Two EDM questions

["Szalata, Zenon M." <zms@slac.stanford.edu>]

1. I was asked to present data in an EDM screen as a bar graph.  That is, the bars start at zero and extend to the value for that particular point; it can be positive or negative.    I need to use auto scale.  Now, I tried setting trace type as "needles", which gives me a bar graph, but it chooses some arbitrary negative baseline from which bars for all points are drawn.  The baseline it chose is somewhat below the lowest point.  Is there a way to produce a "true" bar graph in EDM which might look something like this?

               x
               |    x
               |    |   x
               |    |   |
   0 ------------------------
                  |   |    |
                  x   |    x
                      x

2. I would like to use the UpDown button control.  I have connected it to a control PV which is the VAL in a ao record.  I have assumed that right and left buttons as referred to in the online help are mouse buttons.  Perhaps, they are not.  I want to use the UpDown button to increment or decrement the control PV.  I only can get the drop down menu, which has entries like Save, Restore, etc.  How does one use it to increment/decrement?

Any suggestion will be much appreciated,

Zen