Wicket: Срив при отваряне на ModalWindow (изскачащ прозорец)

В Wicket панел внедрих метод, наречен showAttentiePopup(AjaxRequestTarget), който показва изскачащ екран на ModalWindow. Този метод работи добре, когато го извикам от същия панел. Но когато се опитам да извикам метода от друг панел, той се срива със следната грешка:

java.lang.IllegalStateException: No Page found for component [MarkupContainer [Component id = createAttentie]]
 at org.apache.wicket.Component.getPage(Component.java:1665)
 at org.apache.wicket.RequestCycle.urlFor(RequestCycle.java:851)
 at org.apache.wicket.Component.urlFor(Component.java:3170)
 at org.apache.wicket.behavior.AbstractAjaxBehavior.getCallbackUrl(AbstractAjaxBehavior.java:123)
 at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.getCallbackScript(AbstractDefaultAjaxBehavior.java:116)
 at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.getCallbackScript(AbstractDefaultAjaxBehavior.java:104)
 at org.apache.wicket.extensions.ajax.markup.html.modal.ModalWindow$CloseButtonBehavior.getCallbackScript(ModalWindow.java:876)
 at org.apache.wicket.extensions.ajax.markup.html.modal.ModalWindow.getWindowOpenJavascript(ModalWindow.java:1005)
 at org.apache.wicket.extensions.ajax.markup.html.modal.ModalWindow.show(ModalWindow.java:286)
 at nl.topicuszorg.fks.web.client.dossier.overzichten.documenten.AttentieOverzichtPanel.showAttentiePopup(AttentieOverzichtPanel.java:171)
 at nl.topicuszorg.fks.web.client.dossier.overzichten.documenten.EditFileDocumentPanel$2.onSubmit(EditFileDocumentPanel.java:195)
 at org.apache.wicket.ajax.markup.html.form.AjaxSubmitLink$1.onSubmit(AjaxSubmitLink.java:94)
 at org.apache.wicket.ajax.form.AjaxFormSubmitBehavior.onEvent(AjaxFormSubmitBehavior.java:128)
 at org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:163)
 at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:297)

Някой идея какъв може да е проблема?

Методът showAttentiePopup:

   public void showAttentiePopup(AjaxRequestTarget target) {
         Component content = new EditAttentiePanel(createAttentie.getContentId(), new Attentie(), EditFunctie.AANMAKEN) {

                /** */
                private static final long serialVersionUID = 1L;

                @Override
                protected void annuleren(AjaxRequestTarget target) {

                       FKSModalWindow.closeCurrentWindow(target);
                }

                @Override
                protected void opslaan(AjaxRequestTarget target, Attentie attentie) {
                       //Inhoud even weggelaten
                }

         };

         createAttentie.setOutputMarkupId(true);
         createAttentie.setInitialWidth(900);
         createAttentie.setInitialHeight(450);
         createAttentie.setTitle("Nieuwe Attentie Aanmaken");
         createAttentie.setContent(content);
         createAttentie.show(target);      
   }

Поздрави, Рик