Helix wpf meshbuilder

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C#

WPF

WPF-Toolkit

Hello
is it possible to add a Name or a property to an object (e.g. sphere) that
was created with the Helix Meshbuilder Class?

Background:
I like to add some metadata to all created objects and Show them on a tool-tip
if the user clicks on it.

Any help will appreciated!
Thanks
Smurf

What I have tried:

I named the objects when I created them directly (without Meshbuilder); but this is very very slow and so I use the meshbuilder which is pretty fast; but now I'm not able to name the object because the objects created with the helix meshbuilder has no name property!