how can I determine the selected country on click? 

 How can I determine the selected country when user clicks a specific country? 
Here is what I have done but no luck:

`<Gio
            height="100vh"
            data={this.state.data}
            configs={configs}
            onCountryPicked={callback}
  />`

`function callback(selectedCountry) {
  console.log("selectedCountry ", selectedCountry);
}`