title: datatable not being updated after contextmenu action
body: <p>I have this code:</p>
  
  <pre><code>            &lt;p:contextMenu for="customersTable"&gt;  
              &lt;p:menuitem value="Delete" update="customersTable" icon="ui-icon-close" actionListener="#{customerbean.onDeleteCustomer}"/&gt;  
              &lt;/p:contextMenu&gt;  
  
  
              &lt;p:dataTable id="customersTable" var="customer" widgetVar="customerTable" value="#{customerbean.customerList}" paginator="true" rows="20" paginatorTemplate="{CurrentPageReport}  {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}" rowsPerPageTemplate="10,20,50,100" emptyMessage="#{text['table.customer.filter.notfound']}" filteredValue="#{customerbean.filteredCustomers}" editable="true" draggableColumns="true" rowKey="#{customer.id}" selection="#{customerbean.selectedCustomer}" selectionMode="single"&gt; 
  </code></pre>
  
  <p>My problem is that when I click on the 'Delete' in the contextMenu, everything is working fine in the sense that the record/row is being erased from the backend through the bean-method invocation however the table is not updated reflecting the new data. </p>