Combobox remote in gwt - combobox remoto en gwt

COMBOBOX - remote sample config.txt
Combobox remote in gwt 

ListGridField citiesCountryField = cityListGrid.getField("countryID");
citiesCountryField.setAutoFetchDisplayMap(true);
citiesCountryField.setDisplayField("countryName");
citiesCountryField.setValueField("countryID");
citiesCountryField.setOptionDataSource(CountryDS.getInstance());

combobox remoto en gwt

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