public void ReverseVelocity()
{
CubeGrid.LinearVelocity = new Vector3(CubeGrid.LinearVelocity.X * -1, CubeGrid.LinearVelocity.Y * -1, CubeGrid.LinearVelocity.Z * -1);
CubeGrid.AngularVelocity = new Vector3(CubeGrid.AngularVelocity.X * -1, CubeGrid.AngularVelocity.Y * -1, CubeGrid.AngularVelocity.Z * -1);
RaisePropertyChanged(() => LinearVelocity);
}