Help with InsertColumnBreak in a calc document

[jml3310]

I'm trying to insert a column break in a calc document (sheet) between the 2nd and 3rd columns. Unfortunately, I haven't had a lot of luck finding documentation on how to do this, but this is what I did find and tried:

document = ThisComponent.CurrentController.Frame
dispatcher = createUnoService("com.sun.star.frame.DispatchHelper")
dispatcher.executeDispatch(document, ".uno.InsertColumnBreak","", 0, Array())

I have 2 problems:
1) The above code segment doesn't appear to do anything
2) How do I inidcate which columns the break should be placed between

Thanks