dragging a panelGrid to the design canvas and then modifying the column or rowClass property
causes a ClassCastException.

java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to java.lang.String
at com.sun.jsfcl.std.reference.StyleClassesReferenceDataDefiner.addDesignPropertyItems(StyleClassesReferenceDataDefiner.java:56)
at com.sun.jsfcl.std.reference.DesignPropertyAttachedReferenceData.defineItems(DesignPropertyAttachedReferenceData.java:36)
at com.sun.jsfcl.std.reference.ReferenceData.getItems(ReferenceData.java:56)
at com.sun.jsfcl.std.reference.CompositeReferenceData.defineItems(CompositeReferenceData.java:75)
at com.sun.jsfcl.std.reference.ReferenceData.getItems(ReferenceData.java:56)
at com.sun.jsfcl.std.reference.CompositeReferenceData.getItems(CompositeReferenceData.java:86)
at com.sun.jsfcl.std.reference.CompositeReferenceData.getItemsSorted(CompositeReferenceData.java:96)
at com.sun.jsfcl.std.property.ChooseOneReferenceDataPropertyEditor.getItems(ChooseOneReferenceDataPropertyEditor.java:140)
at com.sun.jsfcl.std.property.ChooseOneReferenceDataPanel.getChoices(ChooseOneReferenceDataPanel.java:90)
at com.sun.jsfcl.std.property.ChooseOneReferenceDataPanel.initializeComponents(ChooseOneReferenceDataPanel.java:206)
at com.sun.jsfcl.std.property.ChooseManyReferenceDataPanel.initializeComponents(ChooseManyReferenceDataPanel.java:258)
at com.sun.jsfcl.std.property.ChooseManyOfManyReferenceDataPanel.initializeComponents(ChooseManyOfManyReferenceDataPanel.java:355)
at com.sun.jsfcl.std.property.AbstractPropertyJPanel.<init>(AbstractPropertyJPanel.java:40)
at com.sun.jsfcl.std.property.ChooseOneReferenceDataPanel.<init>(ChooseOneReferenceDataPanel.java:63)
at com.sun.jsfcl.std.property.ChooseManyReferenceDataPanel.<init>(ChooseManyReferenceDataPanel.java:57)
at com.sun.jsfcl.std.property.ChooseManyOfManyReferenceDataPanel.<init>(ChooseManyOfManyReferenceDataPanel.java:52)
at com.sun.jsfcl.std.property.ChooseManyOfManyReferenceDataPropertyEditor.getCustomEditor(ChooseManyOfManyReferenceDataPropertyEditor.java:39)
at com.sun.rave.propertyeditors.binding.ValueBindingPropertyEditor.getCustomEditor(ValueBindingPropertyEditor.java:345)
at org.openide.explorer.propertysheet.PropertyDialogManager.<init>(PropertyDialogManager.java:111)
at org.openide.explorer.propertysheet.CustomEditorAction.actionPerformed(CustomEditorAction.java:202)
at org.openide.explorer.propertysheet.SheetTable.processMouseEvent(SheetTable.java:685)
at java.awt.Component.processEvent(Component.java:5803)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4410)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3983)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)