"Everything works the way it should with the user cutting the data from the OpenArgs and pasting the data in the Circuit combo box and NoInList event works fine. Is there a way to automate the cutting and pasting ?"
How does the user cut "the data from the OpenArgs"? OpenArgs is not available to the user.
Is the problem not firing the NotInList event when loading the value into the Circuit combo box? If so, use the text property:
Circuit.SetFocus
Circuit.Text = OpenArgs