exemple binding

 <HubSection IsHeaderInteractive="True" DataContext="{Binding Section3Items}" d:DataContext="{Binding Groups[3], Source={d:DesignData Source=../iX.Shared/DataModel/SampleData.json, Type=data:SampleDataSource}}"
                        x:Uid="Section3Header" Header="Asset" Padding="40,40,40,32">
                <DataTemplate>
                    <GridView
                        x:Name="itemGridView"
                        ItemsSource="{Binding Items}"
                        Margin="-9,-14,0,0"
                        AutomationProperties.AutomationId="ItemGridView"
                        AutomationProperties.Name="Items In Group"
                        ItemTemplate="{StaticResource Standard310x260ItemTemplate}"
                        SelectionMode="None"
                        IsSwipeEnabled="false"
                        IsItemClickEnabled="True"
                        ItemClick="Header_Click">
                    </GridView>
                </DataTemplate>
            </HubSection>

<Page.Resources>
 <!-- Grid-appropriate 310 by 260 pixel item template as seen in section 4 -->
 <DataTemplate x:Key="Standard310x260ItemTemplate">
 <Grid Height="250" Width="310" Margin="5,10,5,10">
 <Grid.RowDefinitions>
 <RowDefinition Height="Auto"/>
 <RowDefinition Height="*"/>
 </Grid.RowDefinitions>
 <Border Background="{ThemeResource ListViewItemPlaceholderBackgroundThemeBrush}" Height="150">
 <Image Source="{Binding ImagePath}" Stretch="UniformToFill" AutomationProperties.Name="{Binding Title}"/>
 </Border>
 <StackPanel Grid.Row="1" Margin="0,10,0,0">
 <TextBlock Text="{Binding Title}" Style="{StaticResource TitleTextBlockStyle}" TextWrapping="NoWrap"/>
 <TextBlock Text="{Binding Description}" Style="{StaticResource BodyTextBlockStyle}" MaxHeight="60" />
 </StackPanel>
 </Grid>
 </DataTemplate>
 </Page.Resources>

private async void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)
 {
 // TODO: Create an appropriate data model for your problem domain to replace the sample data
 var sampleDataGroup = await SampleDataSource.GetGroupAsync("Group-4");
 this.DefaultViewModel["Section3Items"] = sampleDataGroup;
 }

public class SampleDataGroup : SampleDataCommon
{
public SampleDataGroup(String uniqueId, String title, String subtitle, String imagePath, String description)
: base(uniqueId, title, subtitle, imagePath, description)
{
}

private ObservableCollection<SampleDataItem> _items = new ObservableCollection<SampleDataItem>();
public ObservableCollection<SampleDataItem> Items
{
get { return this._items; }
}

public IEnumerable<SampleDataItem> TopItems
{
// Provides a subset of the full items collection to bind to from a GroupedItemsPage
// for two reasons: GridView will not virtualize large items collections, and it
// improves the user experience when browsing through groups with large numbers of
// items.
//
// A maximum of 12 items are displayed because it results in filled grid columns
// whether there are 1, 2, 3, 4, or 6 rows displayed

get { return this._items.Take(12); }
}
}

private async Task GetSampleDataAsync()
 {
 if (this._groups.Count != 0)
 return;

 Uri dataUri = new Uri("ms-appx:///DataModel/SampleData.json");

 StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(dataUri);
 string jsonText = await FileIO.ReadTextAsync(file);
 JsonObject jsonObject = JsonObject.Parse(jsonText);
 JsonArray jsonArray = jsonObject["Groups"].GetArray();

 foreach (JsonValue groupValue in jsonArray)
 {
 JsonObject groupObject = groupValue.GetObject();
 SampleDataGroup group = new SampleDataGroup(groupObject["UniqueId"].GetString(),
 groupObject["Title"].GetString(),
 groupObject["Subtitle"].GetString(),
 groupObject["ImagePath"].GetString(),
 groupObject["Description"].GetString());

 foreach (JsonValue itemValue in groupObject["Items"].GetArray())
 {
 JsonObject itemObject = itemValue.GetObject();
 group.Items.Add(new SampleDataItem(itemObject["UniqueId"].GetString(),
 itemObject["Title"].GetString(),
 itemObject["Subtitle"].GetString(),
 itemObject["ImagePath"].GetString(),
 itemObject["Description"].GetString(),
 itemObject["Content"].GetString(),
 group));
 }
 this.Groups.Add(group);
 }
 }