Attributes

Property
Target
Animated
HidingHeight
AutoHiding

Example

<ScrollViewer Name="ScrollViewerSample">
    <Border Height="2000" Margin="8,0">
        <Border.Background>
            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                <GradientStop Color="White" Offset="0"/>
                <GradientStop Color="Black" Offset="1"/>
            </LinearGradientBrush>
        </Border.Background>
    </Border>
</ScrollViewer>
<dev:GotoTop Animated="True" AutoHiding="True" Target="{Binding ElementName=ScrollViewerSample}" HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="0,0,20,20"/>

Demo

you can run demo and see this feature.