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    <p>There are two things to know that should clear things up:</p> <p>First, in XAML, you can access static members through an instance of the type. You can also do this in VB.NET, for instance with this code:</p> <pre><code>Dim x = New MarkupViewModel() x.GetColumnTypes MarkupViewModel.GetColumnTypes </code></pre> <p>The last two lines are equivalent. In fact, the compiler rewrites the first line as the second. XAML is the same way. If you have an instance, you can access a static member through the same syntax as an instance member. (Other languages, like C# and F#, don't allow this syntax).</p> <p>Second, <code>ObjectDataProvider</code> calls a <em>method</em>, but <code>GetColumnTypes</code> is a <em>property</em>. If you had defined it as <code>static member GetColumnTypes() = ...</code> I would expect it to work.</p> <p>However, none of these approaches are really ideal. What you want to do is use the <a href="http://msdn.microsoft.com/en-us/library/ms742135.aspx" rel="nofollow">x:Static</a> markup extension. This is what it was designed for.</p> <p>In your namespace definitions (in the topmost tag of the XAML file), write something like this:</p> <pre><code>&lt;UserControl [...] xmlns:local="clr-namespace:Your.Namespace"&gt; </code></pre> <p>And then have the combo box declare its items like this:</p> <pre><code>&lt;ComboBox ItemsSource="{x:Static local:MarkupViewModel.GetColumnTypes}"&gt; </code></pre> <p>(although if you're keeping it as a property and not a function you should of course rename it as <code>ColumnTypes</code> not <code>GetColumnTypes</code>)</p> <p>Oh, and as for diagnosing binding errors, quite a lot of debugging information is available through <code>Visual Studio Options &gt; Debugging &gt; Output Window &gt; WPF Trace Settings</code>, which can dump a lot of information to the output window. However they can be somewhat difficult to interpret if you don't know WPF very well. An excellent general-purpose WPF utility is <a href="http://snoopwpf.codeplex.com/" rel="nofollow">Snoop</a>, which is good for many other reasons, but it can also display binding error information.</p>
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    1. COI realized a few things when going away from the problem a bit, like the static thing. I already use snoop but did not realize it could show bindings traces. This is all very helpful, thank you.
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    2. COThe C# static rewriting seems wrong though. for instance : var a = (new DateTime()).Now; => Error 2 Member 'System.DateTime.Now.get' cannot be accessed with an instance reference; qualify it with a type name instead
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    3. COOops, you are right. I was tired and mixed up which language supports that syntax (it's a 'feature' that leads to programming errors so I don't really think about it that often). It's VB.NET where those lines are equivalent (also Java and probably a few others). I'll fix my answer.
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