Validation Control

Generic.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
					xmlns:Views="using:Byteflux.Views">
					
	<SolidColorBrush x:Key="ValidationErrorBrush" Color="Orange"/>

	<Style x:Key="ValidationTextStyle" TargetType="TextBlock" BasedOn="{StaticResource ItemTextStyle}">                
		 <Setter Property="HorizontalAlignment" Value="Left"/>
		 <Setter Property="VerticalAlignment" Value="Top"/>
		 <Setter Property="Foreground" Value="{StaticResource ValidationErrorBrush}"/>
	</Style>

	<Style TargetType="Views:ValidationResultPlaceholder">        
		<Setter Property="Margin" Value="0,10,0,10"/>
		<Setter Property="Template">
			<Setter.Value>
				<ControlTemplate TargetType="Views:ValidationResultPlaceholder">
					<ItemsControl ItemsSource="{TemplateBinding Content}">
						<ItemsControl.ItemTemplate>
							<DataTemplate>
								<TextBlock Text="{Binding}" Style="{StaticResource ValidationTextStyle}"/>
							</DataTemplate>
						</ItemsControl.ItemTemplate>
					</ItemsControl>
				</ControlTemplate>
			</Setter.Value>
		</Setter>
	</Style>

</ResourceDictionary>

ValidationResultPlaceholder.cs

namespace Byteflux.Views
{
    using Windows.UI.Xaml.Controls;

    public sealed class ValidationResultPlaceholder : ContentControl
    {
        public ValidationResultPlaceholder()
        {
            DefaultStyleKey = typeof(ValidationResultPlaceholder);
        }
    }
}