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POWPF MultiBinding fails in Syncfusion TabItemExt header
 

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    <p>I have a subclass of <code>TabItem</code> as follows, for which I'm trying to set the <code>Header</code> property. I've tried this with a <code>MultiBinding</code>:</p> <pre><code>&lt;DataEditPane x:TypeArguments="MyType" x:Class="MyDataEditPane"&gt; &lt;DataEditPane.Header&gt; &lt;MultiBinding StringFormat="Hello world {0} {1}"&gt; &lt;Binding Path="BoundVariable1" /&gt; &lt;Binding Path="BoundVariable2" /&gt; &lt;/MultiBinding&gt; &lt;/DataEditPane.Header&gt; &lt;/DataEditPane&gt; </code></pre> <p>But it fails as such:</p> <pre><code>System.Windows.Data Error: 28 : MultiBinding failed because it has no valid Converter. MultiBindingExpression:target element is 'MyDataEditPane' (Name=''); target property is 'Header' (type 'Object') System.Windows.Data Error: 28 : MultiBinding failed because it has no valid Converter. MultiBindingExpression:target element is 'MyDataEditPane' (Name=''); target property is 'Header' (type 'Object') </code></pre> <p>I'd always thought the <code>StringFormat</code> served the role of the converter, but perhaps not?</p> <p>Wrapping the fields together in some kind of container, like a <code>Label</code>, also doesn't seem to work:</p> <pre><code>&lt;DataEditPane x:TypeArguments="MyType" x:Class="MyDataEditPane"&gt; &lt;DataEditPane.Header&gt; &lt;Label&gt; &lt;Label.Text&gt; &lt;MultiBinding StringFormat="Hello world {0} {1}"&gt; &lt;Binding Path="BoundVariable1" /&gt; &lt;Binding Path="BoundVariable2" /&gt; &lt;/MultiBinding&gt; &lt;/Label.Text&gt; &lt;/Label&gt; &lt;/DataEditPane.Header&gt; &lt;/DataEditPane&gt; </code></pre> <p>In this case, the <code>.ToString()</code> representation of the label ("<code>System.Windows.Controls.Label</code>") is shown as the header.</p> <p>Note that a single binding works just fine:</p> <pre><code>&lt;DataEditPane x:TypeArguments="MyType" x:Class="MyDataEditPane"&gt; &lt;DataEditPane.Header&gt; &lt;Binding Path="BoundVariable1" /&gt; &lt;/DataEditPane.Header&gt; &lt;/DataEditPane&gt; </code></pre> <p>If it matters, I'm using the Syncfusion <code>TabItemExt</code> as one of my superclasses in the inheritance hierarchy, but as that class doesn't override the <code>Header</code> property I don't think that makes a difference.</p> <p>What am I doing wrong? I know I can make another property in the ViewModel to act as the Header (and then single-bind that) but I want to learn how to do this properly in XAML.</p>
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