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Editorial Team
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Asked: 2026-06-10T07:20:34+00:00

I’m using the CheckComboBox (from Extended WPF Toolkit ) in an app, and I’d

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I’m using the CheckComboBox (from Extended WPF Toolkit) in an app, and I’d like to make the “textBox” where it shows the selected items a bit wider, (in fact, I want it to fill all the CheckComboBox) but I’m don’t have any idea about how to apply the styles.

CheckComboBox with the problem

Any help?

Thanks!

Current code

 <UserControl
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit">
 <!-- ... -->
 <Label Content="Locale: "/>
 <xctk:CheckComboBox Name="LocaleSelector" ItemsSource="{Binding Locales}" ValueMemberPath="Id" SelectedValue="{Binding SelectedLocales}" Margin="5 2 0 2" />
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1 Answer

  1. Editorial Team

    I finally got it placing this into the UserControl.Resources, and applying the style to the CheckComboBox

    <Style x:Key="MyCustomStyle" TargetType="{x:Type xctk:CheckComboBox}">
    <Style.Resources>
        <Style TargetType="{x:Type TextBox}">
            <Setter Property="HorizontalAlignment" Value="Stretch" />
        </Style>
    </Style.Resources>
</Style>
<!-- ... -->
<xctk:CheckComboBox Name="LocaleSelector" ItemsSource="{Binding Locales}" ValueMemberPath="Id" SelectedValue="{Binding SelectedLocales}" Style="{StaticResource MyCustomStyle" Margin="5 2 0 2" />
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