WPF Storyboard unable to control new instance of this class, confuse with Silverlight app

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XAML

WPF

Silverlight

storyboard

I have a problem with controlling the instance of the class Storyboard.

It's defined in XAML in Resources:

<Window.Resources>
    <Storyboard x:Name="Storyboard1" x:Key="Storyboard1">

Also I'm trying to make it stop, like this:

Storyboard sb = (Storyboard)this.TryFindResource("Storyboard1");
sb.Seek(TimeSpan.Zero);

But, no success. If I try to call in your code to the instance Storybord1 then I've got the errors, that there is NO such instance in the current context (and also, if in C# code I try to look with intellisense also no succes, cause of describing pervious problem).

When I'm trying to find this instance with:

foreach (var item in this.Resources)
{
    MessageBox.Show(item.ToString());
}

No success.

I'm not doing smth difficult or using super-encapsulated design pattern, that I can't find/use it.

Just add one UI element and one Storyboard with changing opacity.

I want just to control by myself all Storyboard's play. When I can Stop it and Start it.

In Silverlight I don't get any troubles ( cause Storyboard1 is accessible in Silverlight ), but in WPF all storyboards by defualt are auto-playing and I can't control the its instances.

How can I solve it?

Thank you!