java.lang.ClassCastException: org.netbeans.modules.form.RADConnectionPropertyEditor$RADConnectionDesignValue cannot be cast to java.net.URL
   at org.netbeans.beaninfo.editors.URLEditor.getAsText(URLEditor.java:83)
   at org.netbeans.modules.form.FormPropertyEditor.getAsText(FormPropertyEditor.java:247)
   at org.openide.explorer.propertysheet.RendererFactory$StringRenderer.reset(RendererFactory.java:963)
   at org.openide.explorer.propertysheet.RendererFactory$StringRenderer.connect(RendererFactory.java:926)
   at org.openide.explorer.propertysheet.RendererFactory.prepareString(RendererFactory.java:383)
   at org.openide.explorer.propertysheet.RendererFactory.getRenderer(RendererFactory.java:246)
   at org.openide.explorer.propertysheet.SheetCellRenderer.getTableCellRendererComponent(SheetCellRenderer.java:158)
   at org.openide.explorer.propertysheet.BaseTable.prepareRenderer(BaseTable.java:626)
   at org.openide.explorer.propertysheet.SheetTable.prepareRenderer(SheetTable.java:622)
   at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2114)
   at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:2016)
   at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:1812)
   at javax.swing.plaf.ComponentUI.update(ComponentUI.java:161)
   at javax.swing.JComponent.paintComponent(JComponent.java:778)
   at org.openide.explorer.propertysheet.BaseTable.paintComponent(BaseTable.java:1031)
   at org.openide.explorer.propertysheet.SheetTable.paintComponent(SheetTable.java:532)
   at javax.swing.JComponent.paint(JComponent.java:1054)
   at org.openide.explorer.propertysheet.BaseTable.paint(BaseTable.java:685)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JViewport.paint(JViewport.java:731)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JSplitPane.paintChildren(JSplitPane.java:1047)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at org.netbeans.swing.tabcontrol.TabbedContainer.paint(TabbedContainer.java:994)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at org.netbeans.swing.tabcontrol.TabbedContainer.paint(TabbedContainer.java:994)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JLayeredPane.paint(JLayeredPane.java:585)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at org.netbeans.core.windows.view.ui.MainWindow$1.paint(MainWindow.java:189)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JLayeredPane.paint(JLayeredPane.java:585)
   at javax.swing.JComponent.paintChildren(JComponent.java:887)
   at javax.swing.JComponent.paint(JComponent.java:1063)
   at javax.swing.JComponent.paintToOffscreen(JComponent.java:5219)
   at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1529)
   at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1452)
   at javax.swing.RepaintManager.paint(RepaintManager.java:1249)
   at javax.swing.JComponent._paintImmediately(JComponent.java:5167)
   at javax.swing.JComponent.paintImmediately(JComponent.java:4978)
   at javax.swing.RepaintManager$3.run(RepaintManager.java:808)
   at javax.swing.RepaintManager$3.run(RepaintManager.java:796)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:796)
   at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:769)
   at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:718)
   at javax.swing.RepaintManager.access$1100(RepaintManager.java:62)
   at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1677)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
   at java.awt.EventQueue.access$200(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:694)
   at java.awt.EventQueue$3.run(EventQueue.java:692)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)