def fill_combobox(self):
        """ Fill Combobox with predefined CKAN API Urls """
        try:
            json_path = self.util.resolve(u'CKAN_APIs.json')
            with open(json_path) as json_file:    
                self.pre_ckan_apis = json.load(json_file, object_pairs_hook=OrderedDict)
            
            for key in self.pre_ckan_apis.keys():
                self.IDC_cbPreCkanApi.addItem(key)
                
            value = self.pre_ckan_apis.itervalues().next()
            self.IDC_lblPreCkan.setText(value)
                
        except __HOLE__ as err:
            self.util.dlg_warning(self.util.tr(u"py_dlg_set_warn_urls_not_load").format(err))
dataset/ETHPy150Open BergWerkGIS/QGIS-CKAN-Browser/CKAN-Browser/ckan_browser_dialog_settings.py/CKANBrowserDialogSettings.fill_combobox