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Hi RobTrew,
Thanks for the answer. It worked.

I think the following is my final question before I get this script working fully..
Let's say again, I have 10 canvases, and I have a loop like this
tell application "OmniGraffle Professional 5"
	set theCanvases to every canvas of the first document
        set myCanvas to fourth canvas of the first document
        set numCanvas to 0 
        set maxItemsPerCanvas to 3
	tell the first document
		repeat with theCanvas in theCanvases
                   tell myCanvas
                      --@CODE TO DRAW SOMETHING
                   end tell
                   set numCanvas to numCanvas + 1
                   if numCanvas > maxItemsPerCanvas then
			set myCanvas to canvas after myCanvas --@HERE
			set maxItemsPerCanvas to maxItemsPerCanvas + maxItemsPerCanvas
		   end if
		end repeat
	end tell
end tell
@HERE : I wanted to set myCanvas to the next Canvas in the document after myCanvas. But this code doesn't work. It is essentially "set myCanvas to fifth canvas" but I want to do this without hardcoding it.