<UserControl.Resources>
<Storyboard x:Key="testStoryboard">
<DoubleAnimation From="0" To="1" Duration="0:0:1"
Storyboard.TargetName="m_ScrollViewer"
Storyboard.TargetProperty="Opacity" />
</Storyboard>
</UserControl.Resources>
Code:
Storyboard story = (Storyboard)this.FindResource("testStoryboard");
story.Begin();