public void MoveUndo()
{
if (stack.Count > 0)
{
CommandKey3 command = stack.Pop();
command.Undo(transform);
}
}
void Start()
{
ok = new CommandOK();
cancel = new CommandCancel();
key1 = new CommandKey1();
key2 = new CommandKey2();
key3 = new CommandKey3();
key4 = new CommandKey4();
}