<p:dialog header="New element" widgetVar="addInsCompany"
   modal="true" height="60" appendToBody="true">
   <h:panelGrid columns="3" cellpadding="5">
              
      <h:outputText value="Name:" />
      <h:inputText value="#{polis_InsCompany.newName}"/>
      <p:commandButton value="Save"
         actionListener="#{polis_InsCompany.saveNewCompany}"
         onclick="addInsCompany.hide();"/>
   </h:panelGrid>
</p:dialog>

public class InsCompany extends PageCodeBase {
   private static final long serialVersionUID = 1L;
   
   @EJB
   private CommonEJBLocal common;
   
   private List<Inscompany> insList;
   
   private String newName;

   ... итд ...

   public void saveNewCompany(ActionEvent actionEvent) {
      if (newName != null && newName.length() > 0) {
         Inscompany cmp = new Inscompany();
         cmp.setId(getNextDTOId(common, Inscompany.class));
         cmp.setName(newName);
      
         common.update(cmp);
         
         insList = null;
         getInsList();
         showInfo("company " + newName + " has been added");
      } else {
         showError("company name can't be empty");
      }
   }
}