ww, you are not too lazy to take time to diss serioca's very reasonable question. Your response does not address their question in the slightest: the "center" example refers to horizontal alignment, not vertical. Can we perhaps hit the Reset button, and return to the question?
The situation is, as serioca has pointed out, that the documentation does not address vertical alignment. The question and the issue are clear. (I cannot help him further, with my level of knowledge about this (otherwise rather good) module.) I'd suggest any responses to this question should actually contribute something.