Question: I'm trying to fade in a new control to my application's "app" area which is programmatically added after the existing controls are removed. My code looks like this:

```
        void settingsButton_Clicked(object sender, EventArgs e)
    {
        ContentCanvas.Children.Clear();

        // Fade in settings panel
        NameScope.SetNameScope(this, new NameScope());

        SettingsPane s = new SettingsPane();
        s.Name = "settingsPane";

        this.RegisterName(s.Name, s);
        this.Resources.Add(s.Name, s);

        Storyboard sb = new Storyboard();

        DoubleAnimation settingsFade = new DoubleAnimation();
        settingsFade.From = 0;
        settingsFade.To = 1;
        settingsFade.Duration = new Duration(TimeSpan.FromSeconds(0.33));
        settingsFade.RepeatBehavior = new RepeatBehavior(1);
        Storyboard.SetTargetName(settingsFade, s.Name);
        Storyboard.SetTargetProperty(settingsFade, new PropertyPath(UserControl.OpacityProperty));

        ContentCanvas.Children.Add(s);

        sb.Children.Add(settingsFade);
        sb.Begin();
    }

```

However, when I run this code, I get the error "No applicable name scope exists to resolve the name 'settingsPane'."

What am I possibly doing wrong? I'm pretty sure I've registered everything properly :(

Answer: 
I solved the problem using this as parameter in the begin method, try:

```
sb.Begin(this);

```

Because the name is registered in the window.
I agree, the namescopes are probably the wrong thing to use for this scenario. Much simpler and easier to use SetTarget rather than SetTargetName. 

In case it helps anyone else, here's what I used to highlight a particular cell in a table with a highlight that decays to nothing. It's a little like the StackOverflow highlight when you add a new answer. 

```
    TableCell cell = table.RowGroups[0].Rows[row].Cells[col];

    // The cell contains just one paragraph; it is the first block
    Paragraph p = (Paragraph)cell.Blocks.FirstBlock;

    // Animate the paragraph: fade the background from Yellow to White,
    // once, through a span of 6 seconds.

    SolidColorBrush brush = new SolidColorBrush(Colors.Yellow);
    p.Background = brush;
    ColorAnimation ca1 = new ColorAnimation()
    {
            From = Colors.Yellow,
            To = Colors.White,
            Duration = new Duration(TimeSpan.FromSeconds(6.0)),
            RepeatBehavior = new RepeatBehavior(1),
            AutoReverse = false,
    };

    brush.BeginAnimation(SolidColorBrush.ColorProperty, ca1);

```