WPF implement SelectedCommand in MVVM via Interaction.Triggers

xmlns:i="http://schemas.microsoft.com/xaml/behaviors"


 <ListBox x:Name="peopleLbx" ItemsSource="{Binding PersonList}">
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="SelectionChanged">
                    <prism:InvokeCommandAction Command="{Binding PersonSelectedCommand}" CommandParameter="{Binding SelectedItem,ElementName=peopleLbx}"/>
                </i:EventTrigger>
            </i:Interaction.Triggers>
        </ListBox>

PersonSelectedCommand = new DelegateCommand<Person>(PersonSelectedExecuted);

private void PersonSelectedExecuted(Person obj)
        {
            // Todo
        }