Using GWTDesigner in UIBinder mode to display 3rd party widgets

Hi

I'm trying to display smartGWT widgets in UIBinder mode. 
I'm using https://code.google.com/p/uibinding-smartgwt/ to do this and I had to modify the existing code to get the GWTDesigner to compile things correctly.

Now I'm getting this error:

java.lang.AssertionError: This UIObject's element is not set; you may be missing a call to either Composite.initWidget() or UIObject.setElement()

Stack trace:

java.lang.AssertionError: This UIObject's element is not set; you may be missing a call to either Composite.initWidget() or UIObject.setElement()  	at com.google.gwt.user.client.ui.UIObject.getElement(UIObject.java:558)  	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)

None of the SmartGWT controls that were wrapped by the uibinding-smartgwt code use the .initWidget() or .setElement(),  So it is an omission by the authors and this could never work, or am I doing something wrong?

Also since SmartGWT controls are different from GWT controls (they do not inherit from them), is the process in UIBinder ALWAYS depending on underlying GWT Control?

I have seen examples of composite GWT Controls, but not complete 3rd party controls.

Regards

Tek

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