/// <summary>
/// Fired when the simulation is closing and needs to clear out any data structures that it created so the program can
/// exit cleanly.
/// </summary>
public override void Destroy()
{
// Windows factory and list of modes in simulation.
windowFactory.Destroy();
windowFactory = null;
lock (windowList)
{
windowList.Clear();
}
// State factory only references parent Windows type, they are added directly to active Windows so no list of them here.
formFactory.Destroy();
formFactory = null;
}