anchor.diff:                          <td>Attribuutlijst:</td>
                           <td>
                               <select name="simpleFeatureType" id="simpleFeatureTypeId">
  -                                <option value="1">Maak uw keuze..</option>
  +                                <option value="-1">Maak uw keuze..</option>
                               </select>
                           </td>
                       </tr>
  
positive.code:                         <td>Attribuutbron:</td>
                          <td>
                              <stripes:select name="featureSourceId" id="featureSourceId">
                                  <stripes:option value="1">Kies..</stripes:option>
                                  <c:forEach var="source" items="${actionBean.featureSources}">
                                      <stripes:option value="${source.id}">${source.protocol} #${source.id} <c:out value="${source.name}"/></stripes:option>
                                  </c:forEach>
  
negative.code:                         removeChilds(simpleFeatureTypeId);
                          simpleFeatureTypeId.appendChild(getOption(-1, 'Kies...', false));
  
                              if(selectedValue != -1) {
                              Ext.Ajax.request({ 
                                  url: '<stripes:url beanclass="nl.b3p.viewer.admin.stripes.AttributeActionBean" event="getFeatureTypes"/>', 
                                  params: { 
  