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POWP7: Binding to an element outside pivot.itemtemplate
 

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    <p>I've been struggling for a while on this. I'm a bit of a newbie, but i lurked a lot and still couldn't find a solution to my problem, so I decided to post my question here.</p> <p>I'm binding a pivot to a collection of objects I want to display to create a gallery. Here is my pivot control bound to a list called gallery, where each object contains 2 strings (url and description).</p> <pre><code>&lt;controls:Pivot ItemsSource="{Binding gallery}" Grid.Row="0" x:Name="galleryPivot"&gt; &lt;controls:Pivot.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;StackPanel&gt; &lt;Grid&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="*" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Image Source="{Binding url}" /&gt; &lt;Grid Visibility="{Binding ElementName=galleryPivot, Path=DataContext.ShowDetail}"&gt; &lt;ListBox&gt; &lt;ListBoxItem&gt; &lt;StackPanel&gt; &lt;TextBlock Text="{Binding description}" /&gt; &lt;/StackPanel&gt; &lt;/ListBoxItem&gt; &lt;/ListBox&gt; &lt;/Grid&gt; &lt;/Grid&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;/controls:Pivot.ItemTemplate&gt; &lt;/controls:Pivot&gt; </code></pre> <p>The datacontext is the viewmodel and initialized in the constructor of the page. Here is my ViewModel:</p> <pre><code>public class GalleryViewModel : INotifyPropertyChanged { public List&lt;Gallery&gt; gallery { get { return Globals.pictures; } } private Visibility _showDetail = Visibility.Collapsed; public Visibility ShowDetail { get { return _showDetail; } set { _showDetail = value; RaisePropertyChanged("ShowDetail"); } } public GalleryViewModel() { } public event PropertyChangedEventHandler PropertyChanged = delegate { return; }; protected void RaisePropertyChanged(string propertyName) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } </code></pre> <p>The gallery object is a list in my ViewModel, as the ShowDetail property. As ShowDetail is outside the scope, I tried to set ElementName as explained <a href="https://stackoverflow.com/questions/4640370/wp7-why-does-a-listbox-itemspanel-break-my-elementname-data-binding">here.</a></p> <p>The pivot binds well to the gallery list, but when I change the value of ShowDetail, the grid won't hide. I also tried to set ElementName to LayoutRoot but it still won't work.</p> <p>My question, how can I bind the visibility when it is outside the scope of the itemtemplate?</p>
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