protected void ChangeState(string newState)
{
// Call OnLeave for the old state.
if (currentState != null)
currentState.OnLeave(newState);
// Instantiate and set the new state.
Assembly a = Assembly.GetExecutingAssembly();
Type t = a.GetType(newState);
currentState = Activator.CreateInstance(t) as State;
// Set up the new state.
currentState._P = propertyBag;
currentState._SM = this;
currentState.OnEnter(currentStateType);
currentStateType = newState;
needToRenderOnEnter = true;
}