I can think of a dozen ways to do similar things to what I think you are asking ..... which is the problem. I'm not sure exactly what you are asking.
There's going to be an action event associated with your command bar when a particular button is pressed. Making changes to your form could happen there.
OpenArgs is just a text value. The Tag property is a text value. You can set a hidden control on the form to hold a text value. I generally use control's tag properties to simulate "control arrays" and use a For Each ctl ... Next loop to get them all.