Visio 2010 / Add-Ons / Visio Extras / Number Shapes

[exotech819]

How do I change the default font size and color when I add shape numbers (done manually) to my shapes.   If I have a drawing already with a  text in my shape, and I try to change font color and size, it changes all the font color and size in my shape.   I want to retain my text size and color and just change the shape number properties when I manually select a shape to add a number to my shape.   Any Ideas?  ed