Hi Ryan
I would recommend dragging the key source from the Live Assist "Buses" tab and changing the widget hint from "toggle buttons" to "label. It sounds like you may have already been going down this path so let me add some screen grabs to clear-up any issues you may have encountered.
This is the control I would grab:

When you drop it in, it will give you this prompt:

When you hit "Ok" it will look a little odd (possibly what you saw as "blank"). What you're actually seeing is the list of all possible sources being shown in a very small space:

If you go into the source editor by double-clicking on the dropped control, you can change the widget from "toggle buttons" to "label" and get the display you wanted:


Once you have created the label, you can make a copy for each key rather than repeat these steps. You would just need to change the "OID" field of the <param/> tag with the correct one for each key's source (you can find these out with the "Param Inspector" tool).

Hope this helps
James
#DashBoard