/// <summary>
/// Undo this instance.
/// </summary>
public void undo()
{
if (_iUndoableCommands.Count > 0)
{
IUndoableCommand toBeRemoved_iundoablecommand = _iUndoableCommands[_iUndoableCommands.Count - 1];
toBeRemoved_iundoablecommand.undo();
_iUndoableCommands.RemoveAt(_iUndoableCommands.Count - 1);
}
}
