CompositeCollection breaks ComboBox AutoComplete-Feature?

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Hello everybody!

I'm using a WPF ComboBox with IsTextSearchEnabled="True" (Autocomplete) and want to bind its ItemsSource-Property to a CompositeCollection. Unfortunately, the Combobox doesn't seem to recognize the items provided by a CollectionContainer within the CompositeCollection. They are shown, but not selected by AutoComplete.

Please try the example, type in "def". If "def" doesn't get selected, you've reproduced the problem I'm f开发者_StackOverflow社区acing. Is there any solution, something that I've overseen or a practical way to work around while having some mergedcollection-capability?

<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
    <XmlDataProvider x:Key="XData1" XPath="/Info">
        <x:XData>
            <Info xmlns="">
                <Item>def</Item>
                <Item>efg</Item>
            </Info>
        </x:XData>
    </XmlDataProvider>

    <CollectionViewSource x:Key='Data1' Source="{Binding Source={StaticResource XData1}, XPath=Item}" />

</Window.Resources>
<Grid>
    <ComboBox IsEditable="True" IsTextSearchEnabled="True" Margin="0,0,0,283">
        <ComboBox.ItemsSource>
            <CompositeCollection>
                <ComboBoxItem>abc</ComboBoxItem>
                <ComboBoxItem>bcd</ComboBoxItem>
                <ComboBoxItem>cde</ComboBoxItem>
                <CollectionContainer Collection="{Binding Source={StaticResource Data1}}" />
            </CompositeCollection>

        </ComboBox.ItemsSource>
    </ComboBox>
</Grid>

Thanks! - dartrax

I've found out that this is solved as soon as you override the ToString()-Function of your Items-object, so that it returns what the items DataTemplate shows.

A complete working example is here: --------> X

• dartrax