How to change shape : rectangle to circle

[Devesh]

Is it possible to change the shape in Visio 2003? like if I have a rectangle,
can I select it and format to make it a circle. Pls help

 

[Paul Herber]

Is it possible to change the shape in Visio 2003? like if I have a rectangle,
can I select it and format to make it a circle. Pls help

Please have a look at my
http://www.sandrila.co.uk/visio-utilities/

which can do shape substitution.