getTextExtent question

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I've been using this code snippet to get the extent of characters, but I must
be doing something wrong. The MleText control below shows an X extent of cx*30 
which I want it to be enough space to allow 30 characters on each line. I can
get only 17 characters. Does anyone see anything wrong.


setFont(Screen, "Courier New", fs, Normal)
		charSize = getTextExtent(Screen,"abcdefghij")

		cx = charSize[1]/10
		cy = charSize[2]+3
		
		commentsId = create(MleText, "", invoiceParameters, cx*3, cy*3, cx*30, cy*4,0)
		setFont(commentsId,"Courier New", fs, Normal)
		tmp = sendMessage(commentsId,EM_LIMITTEXT,108,NULL)
		





	


	


	

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