Change Shape Type

[visnewbie]

I added a shape as Shape Type = Decision.  I need to change the Shape Type to a Process shape.  I just want to change the Shape Type while retaining the text and connectors.  Where do I do this?  I can not find a place in the Shape Sheet to edit the Shape.Type.  I also don't have it available in Properties or Format.  I added Edit Object to the Developer Toolbar but with the shape selected, it does not open.  Any ideas.  (I need to make this change to 20 or 30 shapes!)  Thank you.

[Paul Herber]

It's not something that Visio supports, but, we have an addon that can do this for you.
http://www.sandrila.co.uk/visio-utilities/