How to change display order of shapes within a Smart Art shape?

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dswtan

PPT 2007 B2TR -- how can I change the display order of shapes within a Smart
Art shape?

For example, I have a Radial Venn. After resizing some of the circles, my
center circle is now underneath the surrounding circles. How can I bring the
center circle to the foreground? Searching Help has proved fruitless.
 
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