ComboBox with empty item?

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<ComboBox Name="myComboBox" Width="200" Background="White">    
    <ComboBox.ItemsSource>    
        <CompositeCollection>
           <ComboBoxItem IsEnabled="False" Foreground="Black">Select Item</ComboBoxItem>
           <CollectionContainer Collection="{Binding Source={StaticResource DataKey}}" />    
        </CompositeCollection>
    </ComboBox.ItemsSource>
</ComboBox>

EDIT

As @surfen mentioned in comment, BindingProxy is workaround for the binding issue

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