Hi, is it intended that any wicket:enclosure breaks if it is depending on a component that is not added in the constructor but in "onBeforeRender"?
e.g: <wicket:enclosure child="version"> <tr> <th>Bezeichnung:</th> <td wicket:id="version">value</td> </tr> </wicket:enclosure> with java: public HomePage(final PageParameters parameters) { super(parameters); add(new Label("version", getApplication().getFrameworkSettings().getVersion())); } works while if you delay it to: @Override protected void onBeforeRender() { super.onBeforeRender(); add(new Label("version", getApplication().getFrameworkSettings().getVersion())); } it breaks with: 12:00:25.172 [main] WARN RequestCycleExtra - ******************************** Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.666 sec <<< FAILURE! - in com.mycompany.TestHomePage homepageRendersSuccessfully(com.mycompany.TestHomePage) Time elapsed: 0.589 sec <<< ERROR! org.apache.wicket.WicketRuntimeException: Could not find child with id: version in the wicket:enclosure at org.apache.wicket.markup.html.internal.Enclosure.checkChildComponent(Enclosure.java:295) Best, KB