Hi, is it possible to automate the smartArt shapes. thru VSTO
No, it's not possible to programmatically affect SmartArt shapes.
VSTO can only extend what the Office object model exposes. Since the object models don't provide an automation interface for SmartArt, VSTO has nothing to "hook into".
Currently (Office 2007) you can only affect SmartArt through the Office 2007 OpenXML content. You can find more on this at OpenXMLDeveloper.org
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