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    <p>This is definitely possible and you're on the right track using an <code>AncestorType</code> binding for the <code>ItemsSource</code>. But I think I see a couple of mistakes.</p> <p>First, your <code>ItemsSource</code> should be binding to <code>DataContext.Owners</code>, not <code>DataContext.Houses</code>, correct? You want the viewmodels' collection of Owners to show up in the drop-down. So first, change the <code>ItemsSource</code> and take out the Selection-related stuff, like this:</p> <pre><code>&lt;ComboBox ItemsSource="{Binding Path=DataContext.Owners, RelativeSource={RelativeSource AncestorType={x:Type Window}}}" DisplayMemberPath="Name" /&gt; </code></pre> <p>Now test it out and make sure the <code>ItemsSource</code> is working correctly. Don't try messing around with selection until this part works.</p> <p>Regarding selection, I think you should be binding <code>SelectedItem</code> only - not <code>SelectedValue</code>. For this binding, you <strong>do not</strong> want a <code>RelativeSource</code> binding - the DataContext will be a single <code>House</code> so you can bind directly its <code>HouseOwner</code>. My guess is this:</p> <pre><code>&lt;ComboBox ItemsSource="{Binding Path=DataContext.Owners, RelativeSource={RelativeSource AncestorType={x:Type Window}}}" DisplayMemberPath="Name" SelectedItem="{Binding HouseOwner}" /&gt; </code></pre> <p>Finally, for debugging bindings you can <a href="http://www.falconerdevelopment.com/2011/03/17/debugging-wpf-silverlight-binding-errors-visual-studio/" rel="nofollow">see the Visual Studio Output window</a> or step up to a tool like <a href="http://snoopwpf.codeplex.com/" rel="nofollow">Snoop</a> or <a href="http://wpfinspector.codeplex.com/" rel="nofollow">WPF Inspector</a>. If you plan on doing a lot of WPF, I would recommend getting started with Snoop sooner than later.</p>
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    1. COThanks for taking a look. You're right about the first point; ItemsSource should be **DataContext.Owners**: a typo in my question. I was trying to cut the code down to the relevant pieces and mis-typed that.
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    2. COI've fiddled with my code a bit, and now I have hit a slightly different snag. With the code implemented as you have, with only SelectedItem bound, all the rows show the same value for **HouseOwner**... no idea what that means, but it appears they are not correctly bound. Whilst googling, I came across another suggestion where I have added; IsSynchronizedWithCurrentItem="False" To my ComboBox. This has resulted in the correct values being shown for each item, and the correct choices in the dropdown... however now I am unable to **change** the selection!
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