Text alignment within textbox [Flash 8]

Is it possible to vertically align text within a textbox? I have a movieclip that consists of a single dynamic textbox set for multiline. Some of the instances of that movieclip will have one line of text, others will have two. For the ones that have one line, I would like the text to align vertically within the textbox. All of these movieclips end up getting rotated 90 degrees to become labels at the top of a chart and it looks bad when the single-line text isn’t centered.

If this isn’t possible, is there a way to auto-size the box height so I could use AS to retrieve that height then move the movieclip appropriately?