Public Property MapLayerTemplate As DataTemplate

public DataTemplate MapLayerTemplate {get; set;}

<Grid x:Name="LayoutRoot">
  
  <!-- Define a Resources section for use later in the XAML. -->
  <Grid.Resources>
    
    <!--
    Define the MapLayerTemplate. The DataTemplate adds the ability to control the Opacity (aka. the Visibility) of 
    the various Layers (including any sub-Layers) via a Slider. Additionally, a HyperlinkButton provides Label
    information for the various Layer names. The HyperlinkButton.Uri Property is set to the Url of the individual
    Layers which will display the ArcGIS Server Directory metadata information about the REST web service. Setting 
    the MapLayerTemplate does not override the default DataTemplate settings for the LayerTemplate and 
    LegendItemTemplate. 
    NOTE: The objects that have Binding occur in the MapLayerTemplate are implied to be the Properties of the 
    ESRI.ArcGIS.Client.Toolkit.Primitives.LayerItemViewModel Class.
    -->
    <DataTemplate x:Key="MyMapLayerTemplate">
      <StackPanel Orientation="Horizontal">
        <Slider Maximum="1" Value="{Binding Layer.Opacity, Mode=TwoWay}" Width="50" />
        <HyperlinkButton  Content="{Binding Label}" NavigateUri="{Binding Layer.Url}"/>
      </StackPanel>
    </DataTemplate>
  </Grid.Resources>
  
  <!-- Add a Map Control. -->
  <esri:Map Background="White" HorizontalAlignment="Left" Margin="12,188,0,0" Name="Map1" 
            VerticalAlignment="Top" Height="400" Width="400" >
    
    <!-- Add several different types of Layers to the Map. -->
    <esri:ArcGISTiledMapServiceLayer ID="Street Map" 
            Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"/>
      
    <esri:ArcGISDynamicMapServiceLayer ID="United States" Opacity="0.6" 
           Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StateCityHighway_USA/MapServer"/>
    
    <esri:FeatureLayer ID="H1N1 Flu Counts" Where="PLACE LIKE 'USA'" OutFields="*"
                   Url="http://servicesbeta.esri.com/ArcGIS/rest/services/Health/h1n1/MapServer/0" />
    
  </esri:Map>
  
  <!-- 
  Add a Legend Control. It is bound to the Map Control. The MapLayerTemplate was defined in the <Resources/>
  tags above. The LayerItemsMode of 'Tree' allows seeing of all of the Layer and sub-Layer items expandable by
  leave nodes. 
  NOTE: The Legend_Refreshed event has code-behind logic to cause all of the leaves in the Legend to be collapsed
  to the highest level (i.e. the Layer level) when the application starts up. Had this code-behind logic not been 
  used all of the leaves would have been expanded to their lowest level (this is the default behavior).
  -->
  <esri:Legend HorizontalAlignment="Left" Margin="418,188,0,0" Name="Legend1" 
               VerticalAlignment="Top" Width="350" Height="400" 
               Map="{Binding ElementName=Map1}" LayerItemsMode="Tree"
               MapLayerTemplate="{StaticResource MyMapLayerTemplate}" 
               Refreshed="Legend1_Refreshed"/>
    
  <!-- 
  Interesting XAML Fact:
  Rather than use the DataTemplate that was defined in a set of <Resources/> tags you could optionally
  set the MapLayerTemplate in-line of the <Legend/> tags!
  -->
  <!--
  <esri:Legend HorizontalAlignment="Left" Margin="418,188,0,0" Name="Legend1" 
               VerticalAlignment="Top" Width="350" Height="400" 
               Map="{Binding ElementName=Map1}" LayerItemsMode="Tree">
    <esri:Legend.MapLayerTemplate>
      <DataTemplate>
        <StackPanel Orientation="Horizontal">
          <Slider Maximum="1" Value="{Binding Layer.Opacity, Mode=TwoWay}" Width="50" />
          <HyperlinkButton  Content="{Binding Label}" NavigateUri="{Binding Layer.Url}"/>
        </StackPanel>
      </DataTemplate>
    </esri:Legend.MapLayerTemplate>
  </esri:Legend>
  -->
            
  <!-- Provide the instructions on how to use the sample code. -->
  <TextBlock Height="123" HorizontalAlignment="Left" Name="TextBlock1" VerticalAlignment="Top" Width="756" 
         TextWrapping="Wrap" Margin="12,12,0,0" 
         Text="This example code demonstrates setting the Legend.MapLayerTemplate to a custom DataTemplate
             defined in the <Resources/> tags of XAML. The comments in the XAML code also show an
             option for setting the Legend.MapLayerTemplate in-line of the Legend Control XAML. A code-behind
             function in the Legend_Refreshed event demonstrates how to collapse all of the leaves to their
             highest level (the Layer level) in the Legend Control. Use the Slider to change the Opacity of
             the Layers. Click the Hyperlink to see the ArcGIS Server Directory metadata information about 
             the REST web service." />
            
</Grid>

// NOTE: Don’t forget to insert the following event handler wireups at the end of the 'InitializeComponent' 
// method for forms, 'Page_Init' for web pages, or into a constructor for other classes:
Legend1.Refreshed += new ESRI.ArcGIS.Client.Toolkit.Legend.RefreshedEventHandler(Legend1_Refreshed);
            
private void Legend1_Refreshed(object sender, ESRI.ArcGIS.Client.Toolkit.Legend.RefreshedEventArgs e)
{
  // The purpose of the code in this function is to cause all of the leaves in the Legend to be collapsed
  // to the highest level (i.e. the Layer level) when the application starts up. It is by setting the  
  // LayerItemViewModel.IsExpandable = False for each Layer/sub-Layer that allows this behavior to occur.
  // Had this code-behind logic not been used all of the leaves would have been expanded to their lowest level 
  // in the Legend Control (this is the default behavior).
  
  // Get the Legend.
  ESRI.ArcGIS.Client.Toolkit.Legend theLegend = (ESRI.ArcGIS.Client.Toolkit.Legend)sender;
  
  // Get the LayerItems of the Legend Control.
  Collections.ObjectModel.ObservableCollection<ESRI.ArcGIS.Client.Toolkit.Primitives.LayerItemViewModel> theObservableCollection = theLegend.LayerItems;
  
  // Loop through the ObservableCollection<LayerItemViewModel> objects for each Layer. 
  foreach (ESRI.ArcGIS.Client.Toolkit.Primitives.LayerItemViewModel theLayerItemViewModel in theObservableCollection)
  {
    // Close the leaves in the Legend Control for the particular Layer/sub-Layer.
    theLayerItemViewModel.IsExpanded = false;
  }
}

Private Sub Legend1_Refreshed(ByVal sender As Object, ByVal e As ESRI.ArcGIS.Client.Toolkit.Legend.RefreshedEventArgs) Handles Legend1.Refreshed
  
  ' The purpose of the code in this function is to cause all of the leaves in the Legend to be collapsed
  ' to the highest level (i.e. the Layer level) when the application starts up. It is by setting the  
  ' LayerItemViewModel.IsExpandable = False for each Layer/sub-Layer that allows this behavior to occur.
  ' Had this code-behind logic not been used all of the leaves would have been expanded to their lowest level 
  ' in the Legend Control (this is the default behavior).
  
  ' Get the Legend.
  Dim theLegend As ESRI.ArcGIS.Client.Toolkit.Legend = sender
  
  ' Get the LayerItems of the Legend Control.
  Dim theObservableCollection As Collections.ObjectModel.ObservableCollection(Of ESRI.ArcGIS.Client.Toolkit.Primitives.LayerItemViewModel) = theLegend.LayerItems
  
  ' Loop through the ObservableCollection(Of LayerItemViewModel) objects for each Layer. 
  For Each theLayerItemViewModel As ESRI.ArcGIS.Client.Toolkit.Primitives.LayerItemViewModel In theObservableCollection
    
    ' Close the leaves in the Legend Control for the particular Layer/sub-Layer.
    theLayerItemViewModel.IsExpanded = False
    
  Next
  
End Sub