ClassCastException in console when number of child nodes is large

From jettro, http://hippo.2275632.n2.nabble.com/Problem-with-the-ldap-plugin-ClassCastException-in-console-tp7195784p7195784.html

CMS 2012-01-17 10:27:45,890 ERROR [org.apache.wicket.RequestCycle]
org.hippoecm.frontend.model.tree.LabelTreeNode cannot be cast to
org.hippoecm.frontend.model.tree.IJcrTreeNode
java.lang.ClassCastException: org.hippoecm.frontend.model.tree.LabelTreeNode
cannot be cast to org.hippoecm.frontend.model.tree.IJcrTreeNode
at
org.hippoecm.frontend.plugins.console.browser.BrowserPlugin$BrowserTree.populateTreeItem(BrowserPlugin.java:133)
at
org.apache.wicket.markup.html.tree.AbstractTree$TreeItem.<init>(AbstractTree.java:136)
at
org.apache.wicket.markup.html.tree.AbstractTree.newTreeItem(AbstractTree.java:1549)
at
org.apache.wicket.markup.html.tree.AbstractTree.buildTreeItems(AbstractTree.java:1225)
at
org.apache.wicket.markup.html.tree.AbstractTree.buildItemChildren(AbstractTree.java:1194)
at
org.apache.wicket.markup.html.tree.AbstractTree.onTargetRespond(AbstractTree.java:1091)
at
org.apache.wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.java:557)
at
org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:105)
at