Create new document type / compund type broken

When selecting new compound type got the following stacktrace. (new document type also gives unexpected results)

15.07.2009 17:29:02 ERROR [org.apache.wicket.RequestCycle.logRuntimeException():
1437] Error attaching this container for rendering: [MarkupContainer [Component
id = dialog]]
org.apache.wicket.WicketRuntimeException: Error attaching this container for ren
dering: [MarkupContainer [Component id = dialog]]
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContai
ner.java:1601)
at org.apache.wicket.Component.onBeforeRender(Component.java:3682)
at org.apache.wicket.extensions.ajax.markup.html.modal.ModalWindow.onBef
oreRender(ModalWindow.java:740)
at org.hippoecm.frontend.dialog.PersistentModalWindow.onBeforeRender(Per
sistentModalWindow.java:90)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1002)

at org.apache.wicket.Component.beforeRender(Component.java:1034)
at org.apache.wicket.Component.prepareForRender(Component.java:2160)
at org.apache.wicket.ajax.AjaxRequestTarget.respondComponent(AjaxRequest
Target.java:762)
at org.apache.wicket.ajax.AjaxRequestTarget.respondComponents(AjaxReques
tTarget.java:662)
at org.apache.wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.ja
va:577)