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sanshasansha 

What is the event that gets fired when I change an input field of type multiselect picklist

I have the below code. The field Region__c is an input field of type multiselect picklist. Based on the values selected in this field I need to rerender the PageBlockSection under the outputPanel having Id as "Section1". However this does not happen. The onchange event does not get fired. I have tried onmouseover, onclick events as well but none seem to work.
 
Please suggest.
 
<apex:PageBlockSection title="Basic Information">
          <apex:inputField value="{!Table1__c.Region__c}">
                      <apex:actionSupport event="onchange" rerender="Section1"/>
           </apex:inputfield>
</apex:PageBlockSection>
 
<apex:PageBlockSection title="Information">
                  <apex:inputField value="{!Table1__c.Cash__c}">
                      <apex:actionSupport event="onclick" rerender="Section1"/>
                  </apex:inputField>
</apex:PageBlockSection>
 
<apex:outputPanel id="Section1">
          <apex:PageBlockSection title="Details" rendered="{!Table1__c.Cash__c=TRUE}">
                      <apex:inputField value="{!Table1__c.Field1__c}" rendered="{!CONTAINS(Table1__c.Region__c,'Europe')}"/>
                      <apex:inputField value="{!Table1__c.Field2__c}"/>
          </apex:PageBlockSection>
</apex:outputPanel>