java.lang.ClassCastException: java.lang.String cannot be cast to org.openide.explorer.view.VisualizerNode
   at org.openide.explorer.view.NodeRenderer.findVisualizerNode(NodeRenderer.java:232)
   at org.openide.explorer.view.NodeRenderer.getListCellRendererComponent(NodeRenderer.java:152)
   at javax.swing.plaf.basic.BasicComboBoxUI.getBaseline(BasicComboBoxUI.java:962)
   at javax.swing.JComponent.getBaseline(JComponent.java:2532)
   at javax.swing.GroupLayout$ComponentSpring.getBaseline(GroupLayout.java:3000)
   at javax.swing.GroupLayout$BaselineGroup.calculateBaselineAndResizeBehavior(GroupLayout.java:2657)
   at javax.swing.GroupLayout$BaselineGroup.calculateSize(GroupLayout.java:2633)
   at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568)
   at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325)
   at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604)
   at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1590)
   at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568)
   at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325)
   at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604)
   at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1588)
   at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568)
   at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325)
   at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604)
   at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1588)
   at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568)
   at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325)
   at javax.swing.GroupLayout$SequentialGroup.setValidSize(GroupLayout.java:1972)
   at javax.swing.GroupLayout$Group.setSize(GroupLayout.java:1553)
   at javax.swing.GroupLayout.calculateAutopadding(GroupLayout.java:1058)
   at javax.swing.GroupLayout.layoutContainer(GroupLayout.java:899)
   at java.awt.Container.layout(Container.java:1421)
   at java.awt.Container.doLayout(Container.java:1410)
   at java.awt.Container.validateTree(Container.java:1507)
   at java.awt.Container.validateTree(Container.java:1513)
   at java.awt.Container.validateTree(Container.java:1513)
   at java.awt.Container.validateTree(Container.java:1513)
   at java.awt.Container.validateTree(Container.java:1513)
   at java.awt.Container.validateTree(Container.java:1513)
   at java.awt.Container.validate(Container.java:1480)
   at java.awt.Window.dispatchEventImpl(Window.java:2473)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:130)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)