Setting Jump targets via AppleScript

Hello,

I am trying to use AppleScript to create a Table of Contents page for  
my OG documents.

I think conceptually I've got a pretty good idea of how to do it; loop  
through all the canvases, create a shape whose text is the canvas  
title + page number, and then, I'd like to create a jump target to  
that particular canvas.

The problem is, setting a jump target via applescript doesn't seem to  
work -- when the text is created the inspector still says "Do  
nothing", and using the action browse tool doesn't indicate any  
clickability.  In fact, if I copy the item again via applescript, it  
doesn't show the properties.

Is this a known issue? is there a workaround?

Here's my simple code, FWIW:

tell application "OmniGraffle Professional 5"
	set theHeight to 14.0
	set theCanvases to every canvas of the first document
	tell canvas of front window
		
		repeat with theCanvas in theCanvases
			set theTitle to the name of theCanvas
			set thePage to ((the id of theCanvas))
			make new shape at end of graphics with properties {fill:no fill,  
draws shadow:false, jump:theCanvas, size:{86.0, theHeight}, side  
padding:0, autosizing:full, vertical padding:0, origin:{140.0, 175.0 +  
theHeight * thePage}, text:{text:theTitle, alignment:center}, draws  
stroke:false}
			
			make new shape at end of graphics with properties {fill:no fill,  
draws shadow:false, jump:theCanvas, size:{43.0, 14.0}, side padding:0,  
autosizing:full, vertical padding:0, origin:{85.0, 175.0 + theHeight *  
thePage}, text:{text:thePage as string, alignment:center}, draws  
stroke:false}
		end repeat
	end tell
end tell