Stick in some embedded stylesheet code and make it pass through HTML:
<STYLE TYPE="text/css" MEDIA=screen>
<!--
.searchbold { font-size:10px; font-weight:bold; font-family:arial,helvetica }
.search { font-size:10px; font-family:arial,helvetica }
-->
</STYLE>
The HTML attributes of the Dialog list box are then set to:
"class=search"
or
"class=searchbold"
then the box is displayed smaller.
I like the bold one best.