GWTDesigner in UIBinder mode Opening layout xml file with SmartGWT widgets

Hi,
I'm using Eclipse Kepler with GWT 2.6.1 and   
GWT Designer for GPE (recommended)   
    WindowBuilder Core    1.6.0.r43x201305211944
    WindowBuilder XML Core (requires Eclipse WTP/WST)    1.6.0.r43x201306031653

I have no problem opening vanilla GWT UIBinder layouts, however when I try to open a layout with SmartGWT widgets I get this problem below.
I used the uibinding-smartgwt-1.0.4  wrappers to make SmartGWT controls available to the Designer, and my SmartGWT code sample compiles and runs correctly.

What is the future vision of GWTDesigner to support 3rd party controls in the UIBinder mode?  Are we going back to O

Thanks

Tek

!ENTRY org.eclipse.wb.core 4 4 2014-06-04 17:23:41.426  !MESSAGE Designer [3.1.2.r43x201307151447]: 4108 (Error loading module(s).).   [ERROR] Failed to create an instance of 'org.synthful.smartgwt.client.widgets.UITab' via deferred binding     !STACK 0  org.eclipse.wb.internal.core.utils.exception.DesignerException: 4108 (Error loading module(s).).   [ERROR] Failed to create an instance of 'org.synthful.smartgwt.client.widgets.UITab' via deferred binding     	at com.google.gdt.eclipse.designer.GwtExceptionRewriter.rewrite(GwtExceptionRewriter.java:66)  	at org.eclipse.wb.internal.core.utils.exception.DesignerExceptionUtils.rewriteException(DesignerExceptionUtils.java:225)  	at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.showExceptionOnDesignPane(XmlDesignPage.java:513)  	at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.internal_refreshGEF(XmlDesignPage.java:398)  	at org.eclipse.wb.internal.core.xml.editor.UndoManager.refreshDesignerEditor(UndoManager.java:252)  	at org.eclipse.wb.internal.core.xml.editor.UndoManager.activate(UndoManager.java:85)  	at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.setActive(XmlDesignPage.java:171)  	at org.eclipse.wb.internal.core.xml.editor.AbstractXmlEditor.pageChange(AbstractXmlEditor.java:652)  	at org.eclipse.ui.part.MultiPageEditorPart$2.widgetSelected(MultiPageEditorPart.java:292)  	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)  	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)  	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)  	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1081)  	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066)  	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:778)  	at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3080)  	at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1772)  	at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:279)  	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)  	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)  	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170)  	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)  	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)  	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)  	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)  	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:140)  	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:611)  	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)  	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567)  	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)  	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)  	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)  	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)  	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)  	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354)  	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)  	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)  	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)  	at java.lang.reflect.Method.invoke(Unknown Source)  	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)  	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)  	at org.eclipse.equinox.launcher.Main.run(Main.java:1450)  	at org.eclipse.equinox.launcher.Main.main(Main.java:1426)  Caused by: com.google.gwt.core.ext.UnableToCompleteException: (see previous log entries)  	at com.google.gwt.dev.shell.ModuleSpace.rebindAndCreate(ModuleSpace.java:518)  	at com.google.gwt.dev.shell.designtime.DelegatingModuleSpace.rebindAndCreate0(DelegatingModuleSpace.java:202)  	at sun.reflect.GeneratedMethodAccessor60.invoke(Unknown Source)  	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)  	at java.lang.reflect.Method.invoke(Unknown Source)  	at org.eclipse.wb.internal.core.utils.reflect.ReflectionUtils.invokeMethod(ReflectionUtils.java:869)  	at com.google.gwt.dev.shell.designtime.ModuleSpace.rebindAndCreate0(ModuleSpace.java:237)  	at com.google.gwt.dev.shell.designtime.ModuleSpace.rebindAndCreate(ModuleSpace.java:229)  	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)  	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)  	at java.lang.reflect.Method.invoke(Unknown Source)  	at com.google.gwt.dev.shell.designtime.DelegatingModuleSpace.invokeOnDelegate(D

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