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Editorial Team
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Asked: 2026-06-14T20:03:03+00:00

I’m trying to add a predefined ComboBoxItem into my ComboBox which already has a

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I’m trying to add a predefined ComboBoxItem into my ComboBox which already has a ItemsSource property set. example: 

(Select item)
Item 1
Item 2
Item 3

It’s possible to do this without modifying the original items collection?

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1 Answer

  1. Editorial Team

    Here is some sample code from MSDN that shows the usage of CompositeCollection:

    <ComboBox>
    <ComboBox.ItemsSource>
        <CompositeCollection>
            <ListBoxItem>Please Select</ListBoxItem>
            <CollectionContainer Collection="{Binding Source={StaticResource YOURDATASOURCE}}" />
        </CompositeCollection>
    </ComboBox.ItemsSource>
</ComboBox>

    Here are some references to show you the usage of CompositeCollection:

    1- http://msdn.microsoft.com/en-us/library/system.windows.data.compositecollection.aspx

    2- http://robertbouillon.com/2010/04/17/adding-items-to-a-data-bound-wpf-combobox/

    3- How do I convert a ComboBox to use a bound CompositeCollection?

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