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POUpdate property on view model without code behind?
 

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    <p>I'm using a TreeView inside a Combobox control (from <a href="http://blogs.telerik.com/valerihristov/posts/09-08-27/treeview_in_combobox_take_3_silverlight_3_wpf_and_radcontrols.aspx" rel="nofollow noreferrer">here</a>). I have a ViewModel object that is the DataContext of my window.</p> <p>What I would like to have happen is when the selected item in the treeview/combobox changes I want a property on my ViewModel to be updated with that selected item. Ideally I'd like to be able to do this completely in xaml but I can't quite figure out how to do it.</p> <p>The control has a "SelectedTreeViewItem" dependency property so basically I want to bind that property to a dependency property on my ViewModel object, but I don't know what exactly I need to do it (Trigger? EventTrigger?). The binding only has to be one way as I just want my view model's property to reflect what's currently selected in the control; I don't need to change the control's currectly selected item from my view model. I'm still pretty new to WPF.</p> <p>Here's the code for my control attempting to bind the SelectedTreeViewItem property to a property on my view model. It doesn't work, the property on my view model is always null.</p> <pre><code> &lt;local:TreeViewCombo x:Name="encounterCodeSelector" ItemsSource="{Binding Path=EncounterCodes}" ItemTemplate="{StaticResource EncounterCodesTemplate}" Style="{StaticResource TreeViewInComboBox}" SelectedTreeViewItem="{Binding Path=SelectedEncounterCode, Mode=OneWay}" Canvas.Left="171" Canvas.Top="377" Width="456"&gt; &lt;/local:TreeViewCombo&gt; </code></pre> <p>Edit:</p> <p>Changing the mode from "OneWay" to "OneWayToSource" worked.</p>
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