How can one draw a GeoChart with 
markers<https://google-developers.appspot.com/chart/interactive/docs/gallery/geochart#markerexample>in
 GWT?
I tried to find a example of that but had no luck of finding anything I 
also tried to create my own wrapper following 
THIS<http://code.google.com/p/gwt-google-apis/wiki/VisualizationNewWrapper>official
 document but I complained when I tried to make following method if 
my wrapper:

  @Override
>   protected native JavaScriptObject createJso(Element parent) /*-{
>     return new $wnd.google.visualization.GeoChart(parent);
>   }-*/;


This is the error: com.google.gwt.core.client.JavaScriptException: 
(TypeError): $wnd.google.visualization.GeoChart is not a constructor 

Any pointers would greatly appreciated.

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