XAML demonstrating absence of From property within DoubleAnimation
<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
<Canvas x:Name="LayoutRoot" Background="White">
<Canvas.Triggers>
<EventTrigger RoutedEvent="Canvas.Loaded">
<BeginStoryboard>
<Storyboard x:Name="myStoryboard">
<DoubleAnimation Storyboard.TargetName="myImage"
Storyboard.TargetProperty="Opacity" To="1" Duration="0:0:1" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Canvas.Triggers>
<Image x:Name="myImage" Source="http://server.com/man.png" Opacity=".25" />
</Canvas>
</UserControl>
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