Changing font does not change font size

[chapas]

Trying to change RSS font size in Home.xml file

<control type="rss">
	<animation effect="slide" end="0,90" time="300" tween="sine" easing="inout" condition="$EXP[infodialog_active]">conditional</animation>
	<left>0</left>
	<bottom>0</bottom>
	<height>39</height>
	<width>100%</width>
	<font>font12</font>

Changing from <font>font12</font> to <font>font37</font> does not work, any ideias?