private void BeginCaptureUndo()
{
_historyCommand = new CompositeUndoableCommand();
DrawableUndoableCommand drawableUndoableCommand = new DrawableUndoableCommand(_imageBox);
_imageBoxCommand = new MemorableUndoableCommand(_imageBox);
_imageBoxCommand.BeginState = _imageBox.CreateMemento();
drawableUndoableCommand.Enqueue(_imageBoxCommand);
_historyCommand.Enqueue(drawableUndoableCommand);
}