HighchartsExportingButtonsOptions constructor
      
      HighchartsExportingButtonsOptions({ 
    
- HighchartsExportingButtonsContextButtonOptions? contextButton,
Options for the export related buttons, print and export. In addition to the default buttons listed here, custom buttons can be added. See navigation.buttonOptions for general options.
API Docs: https://api.highcharts.com/highcharts/exporting.buttons
Implementation
HighchartsExportingButtonsOptions({this.contextButton});