td valign="top">
        Constrained automatic width or height. <br>
        Value is computed based on the text in the item,
        but if less than the number specified, is replaced
        by that number.  For example, if you wanted a button
        that was at least 32 pixels wide, you could use this
        knowing that it would expand if the text got bigger.
        </td>
      </tr>
      <tr>
	<td valign="top">
	<tt>CENTER</tt>
	</td>
	<td valign="top">
        Centers the item either horizontally 