private void RemoveCube(CubeModel cube)
{
cube.MarkedForRemoval.Value = true;
Cubes.Remove(cube);
//clean up subscriptions
_disposableSubscriptions[cube].Dispose();
_disposableSubscriptions.Remove(cube);
}
private void CreateCube()
{
var cube = new CubeModel();
var compositeDisposableForThisCube = new CompositeDisposable();
_disposableSubscriptions[cube] = compositeDisposableForThisCube;
var subscription = cube.Collisions.Where(coll => coll >= NumberOfBouncesBeforeDeletion).Subscribe(x => RemoveCube(cube))
.AddTo(compositeDisposableForThisCube);
Cubes.Add(cube);
}