.net MAUI RadComboBox Multiple Selection to command

<telerik:RadComboBox ItemsSource="{Binding Items}" 
                    DisplayMemberPath="Population"
                    x:Name="boundComboBox">
    <telerik:RadComboBox.Behaviors>
        <mct:EventToCommandBehavior EventName="SelectionChanged" x:Name="myBehavior"
                                Command="{Binding SelectionChangedCommand}"
                                EventArgsConverter="{StaticResource SelectionChangedEventArgsConverter}" />
    </telerik:RadComboBox.Behaviors>
</telerik:RadComboBox>

public class SelectionChangedEventArgsConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return value;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {

        return value;
    }
}

private void SelectionChangedExecute(object param)
{
    var selectionEventArgs = param as Telerik.Maui.Controls.ComboBoxSelectionChangedEventArgs;
    if (selectionEventArgs != null)
    {
        var addedItems = selectionEventArgs.AddedItems;
        var removedItems = selectionEventArgs.RemovedItems;
    }
}