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I have a series of questions regarding applescript for omnigraffle professional 5.

Let me start by this:
Let's say I have 10canvases in my document, and I want my script to append/insert a new canvas after the fourth canvas.
I'd imagine it'll be something like this
tell the first document
		set myCanvas to (make new canvas at fourth canvas)
end tell
However this script overwrite my fourth canvas instead of inserting a new canvas.