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POSetting the DataContext for a ContextMenu from a ListView's ItemContainer?
 

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    <p>I am using the mvvm pattern and I am having a hard time figuring out how to set the DataContext on a ContextMenu from inside a ListView’s ItemContainerStyle. </p> <p>I also do not understand why the ListView.ContextMenu and the ListView’s GridView.ColumnHeaderContextMenu can see the properties and commands from my view model, but the ContextMenu inside the ListView.ItemContainerStyle cannot.</p> <p><strong>Error</strong></p> <p>System.Windows.Data Error: 40 : BindingExpression path error: 'AddMenuItem' property not found on 'object' ''Currency' (HashCode=43406546)'. BindingExpression:Path=AddMenuItem; DataItem='Currency' (HashCode=43406546); target element is 'ContextMenu' (Name=''); target property is 'ItemsSource' (type 'IEnumerable')</p> <p><strong>View</strong></p> <pre><code>&lt;!-- Removed styles for clarity. --&gt; &lt;UserControl&gt; &lt;!-- Add ElementSpy to the UserControl’s rsources --&gt; &lt;UserControl.Resources&gt; &lt;framework:ElementSpy x:Key="spy" /&gt; &lt;/UserControl.Resources&gt; &lt;ListView ItemsSource="{Binding Currency}"&gt; &lt;ListView.ItemContainerStyle&gt; &lt;Style TargetType="ListViewItem"&gt; &lt;Setter Property="ContextMenu"&gt; &lt;Setter.Value&gt; &lt;!-- 'AddMenuItem' property not found on 'object' 'Currency' --&gt; &lt;!-- ContextMenu ItemsSource="{Binding AddMenuItem}" / --&gt; &lt;!-- Use the ElementSpy resource --&gt; &lt;ContextMenu ItemsSource="{Binding Source={StaticResource spy}, Path=Element.DataContext.AddMenuItem}" /&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/ListView.ItemContainerStyle&gt; &lt;ListView.ContextMenu&gt; &lt;!-- Works --&gt; &lt;ContextMenu ItemsSource="{Binding EditMenuItem}" /&gt; &lt;/ListView.ContextMenu&gt; &lt;ListView.View&gt; &lt;GridView&gt; &lt;GridView.ColumnHeaderContextMenu&gt; &lt;!-- Works --&gt; &lt;ContextMenu ItemsSource="{Binding SortMenuItem}" /&gt; &lt;/GridView.ColumnHeaderContextMenu&gt; &lt;GridViewColumn Header="Code" DisplayMemberBinding="{Binding Path=Code}" /&gt; &lt;GridViewColumn Header="Description" DisplayMemberBinding="{Binding Path=Description}" /&gt; &lt;GridViewColumn Header="Exchange Rate" DisplayMemberBinding="{Binding Path=ExchangeRate}" /&gt; &lt;/GridView&gt; &lt;/ListView.View&gt; &lt;/ListView&gt; &lt;/UserControl&gt; </code></pre> <p><strong>Code Behind</strong></p> <pre><code>[Export(ViewNames.CurrencyMasterView, typeof(IMasterView))] [PartCreationPolicy(CreationPolicy.Shared)] public partial class CurrencyMasterView : UserControl, IMasterView { public CurrencyMasterView() { InitializeComponent(); } [Import] private MasterViewModel ViewModel { set { this.DataContext = value; } } } </code></pre> <p><strong>ViewModel</strong></p> <pre><code>[Export(typeof(MasterViewModel))] [PartCreationPolicy(CreationPolicy.NonShared)] public class MasterViewModel : ViewModelBase { [ImportingConstructor] public MasterViewModel(IGeneralController generalController, IRegionManager regionManager) { } public ObservableCollection&lt;Currency&gt; Currency { get { return this.currency; } set { if (this.currency != value) { this.currency = value; this.RaisePropertyChanged(() =&gt; this.Currency); } } } public List&lt;MenuItemMvvm&gt; SortMenuItem { get { return this.CreateSortMenuItem(); } } public List&lt;MenuItemMvvm&gt; EditMenuItem { get { return this.CreateEditMenuItem(); } } public List&lt;MenuItemMvvm&gt; AddMenuItem { get { return this.CreateAddMenuItem(); } } private List&lt;MenuItemMvvm&gt; CreateEditMenuItem() { var menu = new List&lt;MenuItemMvvm&gt;(); menu.Add(new MenuItemMvvm("_Edit") { Command = this.EditCommand, Icon = new Image { Source = new BitmapImage(new Uri("pack://application:,,,/POS.Modules.Core;component/Resources/Images/16X16/Edit.png")) } }); menu.Add(new MenuItemMvvm("_Duplicate") { Command = this.DuplicateCommand, Icon = new Image { Source = new BitmapImage(new Uri("pack://application:,,,/POS.Modules.Core;component/Resources/Images/16X16/Copy.png")) } }); menu.Add(new MenuItemMvvm("_Delete") { Command = this.DeleteCommand, Icon = new Image { Source = new BitmapImage(new Uri("pack://application:,,,/POS.Modules.Core;component/Resources/Images/16X16/Delete.png")) } }); return menu; } // Other methods removed for clarity } </code></pre>
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    1. COkevin: See http://stackoverflow.com/questions/504533 and http://stackoverflow.com/questions/2306386 - you can bind via ContextMenu.PlacementTarget.
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