How to customize the appearance of the .NET MAUI ComboBox DropDown (SfComboBox)?

This article guides you on how to customize the appearance of the drop-down for the .NET MAUI ComboBox control in a .NET MAUI application using Theme keys. Customization includes setting the border color and thickness, the selection background color, and the font size for the drop-down items. Below is an example of how to customize the SfComboBox drop-down using a Theme keys.

XAML

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="DropDownCustomizationSample.MainPage"
             xmlns:editors="clr-namespace:Syncfusion.Maui.Inputs;assembly=Syncfusion.Maui.Inputs"
             xmlns:local="clr-namespace:DropDownCustomizationSample"
             xmlns:themes="clr-namespace:Syncfusion.Maui.Core.Themes;assembly=Syncfusion.Maui.Inputs">
    <ContentPage.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <themes:SfComboBoxStyles></themes:SfComboBoxStyles>
                <ResourceDictionary>
                    <x:String x:Key="SfComboBoxTheme">CommonTheme</x:String>
                    <x:Double x:Key="SfComboBoxNormalDropdownStrokeThickness">5</x:Double>
                    <x:Double x:Key="SfComboBoxNormalDropdownItemsFontSize">22</x:Double>
                    <Color x:Key="SfComboBoxDropdownBorder">Pink</Color>
                    <Color x:Key="SfComboBoxDropdownSelectedItemBackground">Brown</Color>
                </ResourceDictionary>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </ContentPage.Resources>
    <StackLayout VerticalOptions="Start" 
                 WidthRequest="400" 
                 HeightRequest="100">
        <editors:SfComboBox Placeholder="Select a Country"
                            TextMemberPath="CountryName"
                            DisplayMemberPath="CountryName"
                            ItemsSource="{Binding CountryCollection}"
                            HeightRequest="40"
                            x:Name="comboBox">
            <editors:SfComboBox.BindingContext>
                <local:ViewModel/>
            </editors:SfComboBox.BindingContext>
        </editors:SfComboBox>
    </StackLayout>
</ContentPage>

Theme keys details

• SfComboBoxNormalDropdownStrokeThickness: Sets the stroke thickness of the dropdown border.

• SfComboBoxNormalDropdownItemsFontSize: Sets the font size of the dropdown items.

• SfComboBoxDropdownBorder: Sets the color of the dropdown border.

• SfComboBoxDropdownSelectedItemBackground: Sets the background color of the selected item in the dropdown.

Output

Download the complete sample from GitHub.

Conclusion

I hope you enjoyed learning how to customize the appearance of the .NET MAUI ComboBox DropDown (SfComboBox).

For more information, refer to our .NET MAUI ComboBox feature tour page for other groundbreaking feature representations. You can explore our .NET MAUI ComboBox documentation to understand how to present and manipulate data.

For current customers, check out our .NET MAUI components from the License and Downloads page. If you are new to Syncfusion®, try our 30-day free trial to check out our .NET MAUI ComboBox (SfComboBox ) and other .NET MAUI components.

Please let us know in the following comments section if you have any queries or require clarifications. You can also contact us through our support forums, Direct-Trac or feedback portal. We are always happy to assist you!