Prism Custom PopupWindowAction

CustomNotificationPopupView

<UserControl x:Class="KNE.Athena.Infrastructure.UserControls.NotificationPopupView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             Width="400"
             Height="180"
             Name="Root">

    <!--The DefaultConfirmationWindow used for a PopupWindowAction in Prism doesn't have Text wrapping.  This gives us text wrapping.-->
    <DockPanel LastChildFill="True" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
        <Button DockPanel.Dock="Bottom" AutomationProperties.AutomationId="NotificationPopupCloseButton" Margin="10" 
                HorizontalAlignment="Right" Width="75" Click="Button_Click">OK</Button>
        <Grid DockPanel.Dock="Top">
            <TextBlock Margin="10,3" TextWrapping="Wrap" HorizontalAlignment="Stretch" VerticalAlignment="Center"  Text="{Binding Content}" />
        </Grid>
    </DockPanel>
</UserControl>

InteractionTriggerPopupAction

<!-- In your view set the WindowContent property to your user control.  
Don't forget the xaml namespace xmlns : i=http://schemas.microsoft.com/expression/2010/interactivity"
-->

< i: Interaction.Triggers>
    < interactionRequest: InteractionRequestTrigger SourceObject ="{Binding NotificationRequest, Mode =OneWay } ">
        < interactionRequest: PopupWindowAction IsModal= "True" CenterOverAssociatedObject= "True" >
            < interactionRequest: PopupWindowAction.WindowContent >
                < userControls: NotificationPopupView />
            </ interactionRequest: PopupWindowAction.WindowContent >
        </ interactionRequest: PopupWindowAction >
    </ interactionRequest: InteractionRequestTrigger >
</ i: Interaction.Triggers>

NotificationPopupView

/// <summary>
/// Interaction logic for UserControl1.xaml
/// </summary>
public partial class NotificationPopupView : UserControl, IInteractionRequestAware
{
    public NotificationPopupView()
    {
        InitializeComponent();
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        if (this.FinishInteraction != null)
        this.FinishInteraction();
    }

    // Both the FinishInteraction and Notification properties will be set by the PopupWindowAction when the Pop-up is shown.
    public Action FinishInteraction { get; set; }
    public INotification Notification { get; set; }
}