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    copied!<p>I've got a magical happy solution.</p> <p>You can create a custom Attached Property that you set in the Style, and upon setting it internally sets the GroupStyle property on the GridView.</p> <p>Attached Property:</p> <pre class="lang-cs prettyprint-override"><code>// Workaround for lack of generics in XAML public class GroupStyleCollection : Collection&lt;GroupStyle&gt; { } public class GroupStyleHelper { public static ICollection&lt;GroupStyle&gt; GetGroupStyle(ItemsControl obj) { return (ICollection&lt;GroupStyle&gt;)obj.GetValue(GroupStyleProperty); } public static void SetGroupStyle(ItemsControl obj, ICollection&lt;GroupStyle&gt; value) { obj.SetValue(GroupStyleProperty, value); } public static readonly DependencyProperty GroupStyleProperty = DependencyProperty.RegisterAttached( "GroupStyle", typeof(ICollection&lt;GroupStyle&gt;), typeof(GroupStyleHelper), new PropertyMetadata(null, OnGroupStyleChanged)); private static void OnGroupStyleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { ItemsControl itemsControl = d as ItemsControl; if (itemsControl == null) return; RefreshGroupStyle(itemsControl, GetGroupStyle(itemsControl)); } private static void RefreshGroupStyle(ItemsControl itemsControl, IEnumerable&lt;GroupStyle&gt; groupStyle) { itemsControl.GroupStyle.Clear(); if (groupStyle == null) return; foreach (var item in groupStyle) { itemsControl.GroupStyle.Add(item); } } } </code></pre> <p>XAML Style:</p> <pre class="lang-xml prettyprint-override"><code> &lt;Style TargetType="ItemsControl"&gt; &lt;Setter Property="GroupStyleTest:GroupStyleHelper.GroupStyle"&gt; &lt;Setter.Value&gt; &lt;GroupStyleTest:GroupStyleCollection&gt; &lt;GroupStyle&gt; &lt;GroupStyle.HeaderTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock FontWeight="Bold" FontSize="15" Text="{Binding Path=Name}" Foreground="HotPink"/&gt; &lt;/DataTemplate&gt; &lt;/GroupStyle.HeaderTemplate&gt; &lt;/GroupStyle&gt; &lt;/GroupStyleTest:GroupStyleCollection&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; </code></pre> <p>Disclaimer: I'm testing this in WPF rather than WinRT but it should work the same, as far as I can tell. That's also why I'm using an ItemsControl rather than GridView, but the property is ItemsControl.GroupStyle anyway.</p>
 

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