In .NET 8 MAUI, I have my custom component that returns an object

public class LanguageModel
{
    public string? LanguageName { get; set; }
    public string? Abbreviation { get; set; }
    public string? Flag { get; set; }
    public bool IsSupported { get; set; } = false;
}

Now, I want to add my component in a ContentView and add a Trigger or a DataTrigger to change, for example, the colour of the text. I tried also with a behaviour but it is not working.

For that, I created a simple Converter like this:

public class IsLanguageEmpty : IValueConverter
{
    public object? Convert(object? value, Type targetType, 
        object? parameter, CultureInfo culture)
    {
        if (value is null)
            return true;

        return false;
    }

    public object? ConvertBack(object? value, Type targetType, 
        object? parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

Now, in the ContentView, I added this XAML

<ldd:LanguageDropdown
    x:Name="lddTarget"
    BorderColor="{StaticResource RedAlert}"
    Placeholder="{lang:Translate DictionaryLanguage}"
    SelectedItem="{Binding LanguageTarget}"
    SemanticProperties.Description="{lang:Translate DictionaryLanguage}"
    TextSize="{StaticResource ElementFontSizeNormal}">
    <ldd:LanguageDropdown.Triggers>
        <DataTrigger Binding="{Binding LanguageTarget, 
                Converter={StaticResource LanguageConverter}}" 
                TargetType="ldd:LanguageDropdown">
            <DataTrigger.Value>true</DataTrigger.Value>
            <Setter Property="BorderColor" 
                Value="{StaticResource RedAlert}" />
        </DataTrigger>
    </ldd:LanguageDropdown.Triggers>
</ldd:LanguageDropdown>

The value SelectedValue changes when a new item is selected. If not, it is null or empty. Although the SelectedValue is empty or not, the converter is not called.