I've generated a complex XAML from 3DS. This 3D model has lots of Model3DGroups, each with its own transform. It represents an industrial robot with 2 pieces in its extremes. How can I make these 2 pieces to be Visible and/or Invisible. It looks like Visibility is not a property here. I must switch between those 2 states, and this is going to happen at different time frames and positions. Any ideas are welcome.