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POWPF Single Selection Across Multiple ItemsControls
 

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    <p>Part of my app has a month-view calendar interface, but I'm having trouble with item selection. The interface is set up so that each of the days in the view contains a <code>ListBox</code> of items, much like the month view in Outlook. The problem I'm experiencing is that I need to maintain a single item selection across all of the <code>ListBox</code>es.</p> <p>Below is a sample that should adequately describe my situation. I need to maintain a single selection between both <code>ListBox</code>es.</p> <pre><code>&lt;Window x:Class="StackOverflow.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition /&gt; &lt;ColumnDefinition /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;ListBox ItemsSource="{Binding Numbers}" SelectedItem="{Binding SelectedObject"/&gt; &lt;ListBox Grid.Column="1" ItemsSource="{Binding Dates}" SelectedItem="{Binding SelectedObject"/&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>And the view model for the window:</p> <pre><code>class MainWindowViewModel : DependencyObject { public static readonly DependencyProperty SelectedObjectProperty = DependencyProperty.Register("SelectedObject", typeof(object), typeof(MainWindowViewModel), new UIPropertyMetadata(null)); public ObservableCollection&lt;int&gt; Numbers { get; set; } public ObservableCollection&lt;DateTime&gt; Dates { get; set; } public object SelectedObject { get { return GetValue(SelectedObjectProperty); } set { SetValue(SelectedObjectProperty, value); } } } </code></pre> <p>In this primitive example, I would expect that when the SelectedObject property of my view model gets set to an item that's not in one <code>ListBox</code>, the selection would be removed in that <code>ListBox</code>, but that doesn't happen. I understand that I can simply name each ListBox, and hook into the SelectionChanged event. I'd prefer to not have to do that with an entire month-view calendar. There <em>has</em> to be a better way.</p> <p>In a previous iteration of the app, I was able to create a SelectionManager static class with an attached property that was used to maintain selection. However, I can't use this now as the classes I'm using for my items are not <code>DependencyObject</code>s, and I'd really prefer not to have to create <code>DependencyObject</code> wrapper classes as this will considerably complicate my architecture.</p> <p>Thanks.</p> <p><strong>EDIT 1:</strong> Added a view model class as requested.</p>
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