<esri:MarkerSymbol x:Key="SymbolIDName" OffsetX="15" OffsetY="28">
<esri:MarkerSymbol.ControlTemplate>
<ControlTemplate>
<Canvas Width="35" Height="35">
<Image Source="ImageSource" Width="30" Height="30"/>
<TextBlock Foreground="White" Canvas.Top="-8.5" Canvas.Left="22" Text="{Binding Attributes[LabelAttribute]}" />
</Canvas>
</ControlTemplate>
</esri:MarkerSymbol.ControlTemplate>
</esri:MarkerSymbol>