Try these. No guarantee that they'll work though. I've removed my CMS in favour of using Logician's Webtemplates and so I can't test on my board. If they don't work then those widths probably aren't defined in the .css
PHP Code:
<?xml version="1.0" encoding="UTF-8"?>
<grids>
<grid name="Sidebar + Column + Sidebar (200px, 100%, 200px)" auxheader="0" auxfooter="0" addcolumn="1" addcolumnsnap="1" addcolumnsize="3" columns="0"><![CDATA[<div id="doc3" class="yui-tvb-r3">
<div id="bd">
<div id="yui-main">
<div class="yui-b">
<div class="yui-gf">
<div class="yui-u first yui-sidebar">
<ul class="list_no_decoration widget_list" id="widgetlist_column1">$column[1]</ul>
</div>
<div class="yui-u yui-panel">
<ul class="list_no_decoration widget_list" id="widgetlist_column2">$column[2]</ul>
</div>
</div>
</div>
</div>
<div class="yui-b yui-sidebar">
<ul class="list_no_decoration widget_list" id="widgetlist_column3">$column[3]</ul>
</div>
</div>
</div>
]]></grid>
</grids>
PHP Code:
<?xml version="1.0" encoding="UTF-8"?>
<grids>
<grid name="Sidebar + Column + Sidebar (240px, 100%, 240px)" auxheader="0" auxfooter="0" addcolumn="1" addcolumnsnap="1" addcolumnsize="3" columns="0"><![CDATA[<div id="doc3" class="yui-tvb-r3">
<div id="bd">
<div id="yui-main">
<div class="yui-b">
<div class="yui-gf">
<div class="yui-u first yui-sidebar">
<ul class="list_no_decoration widget_list" id="widgetlist_column1">$column[1]</ul>
</div>
<div class="yui-u yui-panel">
<ul class="list_no_decoration widget_list" id="widgetlist_column2">$column[2]</ul>
</div>
</div>
</div>
</div>
<div class="yui-b yui-sidebar">
<ul class="list_no_decoration widget_list" id="widgetlist_column3">$column[3]</ul>
</div>
</div>
</div>
]]></grid>
</grids>