SkechLayer load down tiled Map

LucaAlferi1

Hi
In my application i use different base map. When application is loaded for the first time, skechLayer draw up tiled map (OK), but when i change the base map the skechLayer draws down the tiled map.
i used this code:

AGSGraphicsLayer* graphicsLayer2 = [AGSGraphicsLayer graphicsLayer];
[self.mapView addMapLayer:graphicsLayer2 withName:@Graphics Layer 2];
    self.sketchLayer = [AGSSketchGraphicsLayer graphicsLayer];
    [self.mapView addMapLayer:self.sketchLayer withName:@Sketch layer];

Why?
Help me please

NimeshJarecha

How you are changing the base map? You should use AGSMapView's insertMapLayer:withName:atIndex: method and insert base layer at index 0.

Regards,
Nimesh