I have been working on a way to do this for some time now. It doesn't work that well sending commands directly from Dashboard to the Videohub (although this is not impossible, just has very limited functionality), so I've programmed an arduino to sit between them to accept Rosstalk commands and pass them to the videohub.
By doing this not only can you have multiple dashboard panels open to one hub, but you can store macros/presets, set patching with visual feedback, create timed schedules and link GPI/O to and from the hub, allowing full control/recall of all these functions from multiple dashboard panels simultaneously.
Anyways let me know if you needed some more info~
#DashBoard