nuke cornerpin (python) help

So I’ve been looking at how I can improve the to/from thing in the corner pin.
With the help of this article http://www.nukepedia.com/written-tut…erators-nodes/
I’ve managed to do the expression linking, and using a user knob to set a reference frame, to link the "from" position to the "to" position on a certain frame (kind of like in shake :)).
So for instance for "from1" the expression would be "to1.x(refFrame)" etc.
But how do I add this to my menu py, so that every time i start nuke, it’ll add the expressions and add the user knob with the reference frame to the corner pin node.

Many thanks,

Tom

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