different EventSources not styled

[geomoes]

I have a problem to style different Eventsources. The events are loaded using the etraParams as filter, but they all are displayed with the default backgroundColor?

eventSources: [
            {
              url: 'https://example.com/data/get_events_json.php',
                extraParams: {
                	region: 'S',
              	},
               backgroundColor: 'SandyBrown',
               textColor: 'black',
            },
            {
              url: 'https://example.com/data/get_events_json.php',
                extraParams: {
                	region: 'N',	
              },
              backgroundColor: 'DarkKhaki',
              textColor: 'black',
            }
          ]

[vkurko]

Sorry, but nowhere is it stated that it should work like this.