How to give a tooltip(or a tag) to a 3D object in WPF?

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C#

.NET

WPF

graphics

I have created four 3D cubes(something that looks like cube) using C# as codebehind in WPF and I would like to add a tooltip (or a tag) to them when they appear on the screen. When I move my mouse over the cube, the tooltip should display "cube1" or "cube2"

this is just a part of a method i've written to create a cube in C#.

meshgeometry = new GeometryModel3D(mesh, diffmaterial);
ModelUIElement3D m = new ModelUIElement3D();
m.Model = meshgeometry;
visual.Children.Add(m);

This method is called four times with in the constructor. I would like to address (or access) individual cubes and give them a tag ? How can i do this ? please help.I am stuck. Can i do something like Children[0]."something" to access every cube ? I am a beginner and please go easy on me.