andychristopher,
Your code is not a Css Class. You should put it into Css Style dropdown instead of CssClass dropdown.
<CssStyle>
<item text="[[NotSet]]" value="null"></item>
<item text="font-size:18pt" value="font-size:18pt"></item>
<item text="color:red" value="color:red"></item>
<item text="border:1px red solid" value="border:1px red solid"></item>
<!--<item text="filter:alpha(opacity=20)">filter:alpha(opacity=20)</item> -->
</CssStyle>
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