title: Primefaces selectCheckboxMenu filter doesn't work while selectOneMenu well inside datatable
body: <p>I have a Primefaces(5.0) datatable. I use two column filters: selectOneMenu(Filter1) and selectCheckboxMenu(Filter2).</p>
  <p>Both filter's data are being filled fine. selectOneMenu(Filter1) can filter the DataTable but the selectCheckboxMenu(Filter2) finds no any data after selecting a value.</p>
  <p><strong>JSF</strong></p>
  <pre><code>&lt;p:dataTable value=&quot;#{employeeBean.employees}&quot; var=&quot;employee&quot; id=&quot;employeeDTable&quot;
      emptyMessage=&quot;No data&quot; filteredValue=&quot;#{employeeBean.filteredEmployees}&quot;
      widgetVar=&quot;empWidgetVar&quot; rowKey=&quot;#{employee.id}&quot;&gt;
      
      &lt;!-- THIS WORKS --&gt;
      &lt;p:column headerText=&quot;Filter1&quot; filterBy=&quot;truck.id&quot; filterMatchMode=&quot;exact&quot;&gt;
          &lt;f:facet name=&quot;filter&quot;&gt;
              &lt;p:selectOneMenu onchange=&quot;PF('empWidgetVar').filter()&quot;&gt;
                  &lt;f:selectItems value=&quot;#{dropdowns.trucksWithAllOption}&quot;/&gt;
              &lt;/p:selectOneMenu&gt;
          &lt;/f:facet&gt;
          &lt;h:outputText value=&quot;#{employee.truck.license}&quot;/&gt;
      &lt;/p:column&gt;
      
      &lt;!-- THIS DOESN'T WORK (Doesn't find any data) --&gt;
      &lt;p:column headerText=&quot;Filter2&quot; filterBy=&quot;truck.id&quot; filterMatchMode=&quot;in&quot;&gt;
          &lt;f:facet name=&quot;filter&quot;&gt;
              &lt;p:selectCheckboxMenu onchange=&quot;PF('empWidgetVar').filter()&quot; label=&quot;Vrachtwagen&quot;&gt;
                  &lt;f:selectItems value=&quot;#{dropdowns.trucksWithAllOption}&quot;/&gt;
              &lt;/p:selectCheckboxMenu&gt;
          &lt;/f:facet&gt;
          &lt;h:outputText value=&quot;#{employee.truck.license}&quot;/&gt;
      &lt;/p:column&gt;
      
  &lt;/p:dataTable&gt;
  </code></pre>
  <p><strong>dropdowns.trucksWithAllOption</strong></p>
  <p><img src="https://i.stack.imgur.com/MB5Kf.png" alt="enter image description here" /></p>
  <p><strong>Rendered Filter1</strong></p>
  <p><img src="https://i.stack.imgur.com/mfk8m.png" alt="enter image description here" /></p>
  <p><strong>Rendered Filter2</strong></p>
  <p><img src="https://i.stack.imgur.com/tKCA0.png" alt="enter image description here" /></p>
  <p>Why selectCheckboxMenu(Filter2) can't find any data while selectOneMenu(Filter1) finds well with the same data?</p>