internal override void OnDispose(bool disposing)
{
// In order to allow clean exit we first must release all cached instances because they hold references to
// native objects and that prevents them being deallocated. If we failed to do that then Context destructor
// would run before destroctors of other objects (subsystems, etc). Everything that inherits from
// Urho3D.Object accesses Context on destruction and that would cause a crash.
Instance = null;
InstanceCache.Dispose();
}