ColorAnimation, Completed event doesn't work more then once

I have code:

<UserControl.Resources>
    <SolidColorBrush x:Key="KeysBorderBrush" Color="DimGray" />
</UserControl.Resources>

<ComboBox Name="Keys" HorizontalAlignment="Left" Margin="116,2,0,2" Width="122" BorderBrush="{DynamicResource KeysBorderBrush}" />

And codebehind:

    SolidColorBrush keysBorderBrush;
    ColorAnimation _keysAnimation;

    public Constructor()
    {
        _keysAnimation  = new ColorAnimation();
        _keysAnimation.Completed += _keysAnimation_Completed;
    }

    private void Active_Checked(object sender, RoutedEventArgs e)
    {

        keysBorderBrush = (SolidColorBrush)this.FindResource("KeysBorderBrush");
        keysBorderBrush.Color = Colors.Black;

        _keysAnimation.To = Colors.Red;
        _keysAnimation.AutoReverse = true;
        _keysAnimation.RepeatBehavior = new RepeatBehavior(2);
        _keysAnimation.DecelerationRatio = .1;
        _keysAnimation.Duration = TimeSpan.FromMilliseconds(500);

        keysBorderBrush.BeginAnimation(SolidColorBrush.ColorProperty, _keysAnimation);

    }
    void _keysAnimation_Completed(object sender, EventArgs e)
    {
        keysBorderBrush.Color = Colors.DimGray;
    }

My goal: Set the color to black, then animate, then return color to gray in _keysAnimation_Completed event.

The problem in the _keysAnimation_Completed event handler, it doesn't whant set the color back to DimGray, it works just one time, in second+ times color stay in Black all of time, how can I fix it?

If you add _keysAnimation.FillBehavior = FillBehavior.Stop, it will work as you expect it to.

Your Active_Checked method should look like this:

private void Active_Checked(object sender, RoutedEventArgs e)
{
    _keysBorderBrush = (SolidColorBrush) FindResource("KeysBorderBrush");
    _keysBorderBrush.Color = Colors.Black;

    _keysAnimation.To = Colors.Red;
    _keysAnimation.AutoReverse = true;
    _keysAnimation.RepeatBehavior = new RepeatBehavior(2);
    _keysAnimation.DecelerationRatio = .1;
    _keysAnimation.Duration = TimeSpan.FromMilliseconds(500);
    _keysAnimation.FillBehavior = FillBehavior.Stop;

    _keysBorderBrush.BeginAnimation(SolidColorBrush.ColorProperty, _keysAnimation);
}