Tiled layer does not display all levels

Question

I'm using two tiled services to display in my map. The ocean basemap and the world light gray canvas map. If I zoom past level 9 on the US Virgin Islands, the ocean basemap shows me "map data not yet available". I understand that part. What I don't understand is why the other basemap I've set up to display on the map does not appear until level 14. This happens regardless if I use the displayLevels parameter. Yet, if I look at that service through the services directory in the Javascript viewer I can see all of the levels including the ones between 9 and 14. Overview Map

MikeOnzay · Answer

The solution was to specify display levels on both of the layers I wanted to use (as the previous user suggested). I also made sure to not use the same level (10) in both layers.
basemap = new esri.layers.ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/Canvas/World_Light_Gray_Base/MapServer",{displayLevels:[10,11,12,13,14,15,16]});
map.addLayer(basemap); //added this layer so there would be a large number of zoom levels and for overview map

oceanBM = new esri.layers.ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/Ocean_Basemap/MapServer",{displayLevels:[0,1,2,3,4,5,6,7,8,9]});
map.addLayer(oceanBM);

MikeOnzay · Answer

I want it the other way around. When the ocean basemap disappears I want the light canvas map to appear.

SumitSharma · Answer

Hello mike, Please try the following and see if this works!! Overview Map

Cheers!! SS