OSM as defaul map in ArcGIS Map Web Part

[KoryunAkopyan]

Hi everyone. Please, help me or give any advice. I'm trying set default map in the ArcGIS web part to OpenStreetMap by editing MapWebPartStartupMapDocument. But it doesn't work. I tried to like this

<?xml version="1.0" encoding="utf-8"?>
<e:Map xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:e="http://schemas.esri.com/arcgis/client/2009"
   xmlns:esriMapping="http://schemas.esri.com/arcgis/mapping/2009"
   xmlns:esriExtensibility="http://schemas.esri.com/arcgis/client/extensibility/2010">
  <esriMapping:ScaleBarExtensions.ScaleBarMapUnit>Meters</esriMapping:ScaleBarExtensions.ScaleBarMapUnit>
  <e:Map.IsLogoVisible>False</e:Map.IsLogoVisible>
  <e:Map.Extent>
    <e:Envelope XMin="-16334576.8010418" YMin="699595.291282528" XMax="-6812752.83654833" YMax="7913098.29468664">
      <e:Envelope.SpatialReference>
        <e:SpatialReference WKID="102113" />
      </e:Envelope.SpatialReference>
    </e:Envelope>
  </e:Map.Extent>
  <e:OpenStreetMapLayer Url="http://OpenStreetMap.org" esriExtensibility:Document.IsBaseMap="True" esriExtensibility:MapApplication.LayerName="Topographic"/>
</e:Map>

I tried TiledMapServiceLayer and 102100, but it doesn't work too. Can anyone tell me how can I solve this problem?