xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Background="{x:Static SystemColors.WindowBrush}"
Name="page">
VerticalAlignment="Center"
Background="{DynamicResource
{x:Static SystemColors.ControlBrushKey}}">
Storyboard.TargetName="page"
Storyboard.TargetProperty="Background.Color"
To="Red" Duration="0:0:1" />