events not firing in VisualForce

In the page below,Topic__c is a single-select picklist. My intention is to have this list control which of the input fields is available below. The user s开发者_StackOverflow社区elects an option, and the onchange event should fire, and rerender the fields.

<apex:inputField value="{!Call_Report__c.Topic__c}" id="topic" > 
           <apex:actionSupport event="onchange" reRender="tickerInput,sectorInput,bondInput">  
             <apex:param name="topicSelection" value="{!Call_Report__c.Topic__c}" /> 
            </apex:actionSupport> 
 </apex:inputField>
<apex:inputField value="{!Call_Report__c.Tickers__c}" rendered="{!Call_Report__c.Topic__c='Issuer'}" id="tickerInput" />
<apex:inputField value="{!Call_Report__c.Sector__c}" rendered="{!Call_Report__c.Topic__c='Industry'}" id="sectorInput"/> 
<apex:inputField value="{!Call_Report__c.Security__c}" rendered="{!Call_Report__c.Topic__c='Specific Bond'}" id="bondInput" />

Am I doing something obviously wrong here? http://community.salesforce.com/t5/Visualforce-Development/Multi-select-picklist-not-firing-event-for-AJAX-refreshes/m-p/173572/highlight/false#M22119 seems to imply that what I am doing is reasonable...

I'm pretty sure you need to rerender at a higher level than that, like at the level of an <apex:outputPanel id="thePanel"> or an <apex:page id="thePage">

I agree. Try wrapping your code in an outputPanel and rerendering that.