Alternatively, `navigator.xAxis.plotBands` can be used: http://jsfiddle.net/Lm85088q/1/

Currently there is no SVG element sitting behind the navigator that you can apply a style to. The closest thing you get is http://api.highcharts.com/highstock/navigator.maskInside.

Otherwise, you can create your own styled rectangle programmatically: http://jsfiddle.net/highcharts/Lm85088q/

I think he meaned what he said. The navigator.
Trying to change the color of the Navigator Background since 3 days but no chance.
Why is it impossible to fill this area?

Do you mean "scrollbar.barBackGroundColor" ? See API: http://api.highcharts.com/highstock#scrollbar.barBackgroundColor

of course i mean navigator bar