New Post: TilePrefetcher process

I am trying to generate "packages" of prefetched areas.

Either I am not doing this properly, or my understanding of this feature is wrong.

First I get the selected area which gives me the RectLatLng object.

Then, like in the demo, I loop through zoom levels to the MaxZoom.

for (int i = (int)wMap.Zoom; i <= wMap.MaxZoom; i++)
            {
                TilePrefetcher tpf = new TilePrefetcher() { Owner = this, ShowCompleteMessage = true };
                tpf.Start(area, i, wMap.MapProvider, 100);                
            }

Everything appear to work there, however, when I try to zoom in, the message states the tiles are not available.

I have added Export / Import after the looping, loaded the export in the demo app, but the higher zoom level tiles do not appear. There do seem to be some other random tiles found.