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You can get the styling properties of the text of a graphic with this applescript:

tell application "OmniGraffle Professional 5"
	tell canvas of front window
		set p to properties of text of shape 1
	end tell
end tell
you will get something like this
{superscript:missing value, underlined:false, color:{0, 0, 0}, font:"Tahoma Bold", size:12.0, text:"some text", class:text, alignment:center, baseline offset:missing value}