ScatterSurface3D Effects

Hi All,

Hope someone can assist me. I have a ScatterSurface3D and a XamDatagrid. I need to add focus to a certain point or highlight it on the scatterSurface3D. I need the yellow block to show on my scattersurface3D.

So if the yellow block moves the point will be highlighted on the cube. 

This is a sample of what i want to achieve (Blue block):

Friendly Regards,