Adjust project structure

src/Shared/HandyControlDemo_Shared/UserControl/Controls/GotoTopDemoCtl.xaml

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+<UserControl x:Class="HandyControlDemo.UserControl.GotoTopDemoCtl"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:controls="clr-namespace:HandyControl.Controls;assembly=HandyControl"
+             Background="{DynamicResource RegionBrush}">
+    <controls:TransitioningContentControl>
+        <controls:SimplePanel Width="500" Height="400">
+            <controls:ScrollViewer Name="ScrollViewerDemo" IsEnableInertia="True" Margin="0,10,0,0">
+                <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>
+            </controls:ScrollViewer>
+            <controls:GotoTop Animated="True" AutoHiding="True" AnimationTime="500" Target="{Binding ElementName=ScrollViewerDemo}" HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="0,0,20,20"/>
+        </controls:SimplePanel>
+    </controls:TransitioningContentControl>
+</UserControl>