call map value from binding

Hi,

I guess this is more of an OGNL question, but maybe someone could fill me in
quickly.  How do you pull a value from a HashMap from within a tapestry
binding?

I'm trying to do something like:

<component id="columnTitle" type="Insert">
     <binding name="value" expression="columnMap.get(name)"/>
 </component>

Thanks in advance.
Eric



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