public void RemoveState(int state)
{
foreach (var node in states[state].containedNodes)
{
RemoveState(node);
}
if (states[state].parent >= 0)
{
states[states[state].parent].containedNodes.Remove(state);
}
transitions.RemoveAll((t) => t.source == state || t.target == state);
states.Remove(state);
}