When creating a dashboard you can add text to a button, however you can not make the text wrap to mulitple lines.
This is a limitation of the 3rd party Farpoint control that we use.
The following is from their support website:
Re: Line wrap on a CellTypeButton
The only way to get this appearance is by creating a bmp of the text the way you want it to look and load that as the picture on the button.
Bob M.
FarPoint Technologies, Inc.
http://www.clubfarpoint.com/Forums/forums/post/23868.aspx