add PreviewSlider

HandyControlDemo/UserControl/Controls/PreviewSliderDemoCtl.xaml

@@ -0,0 +1,13 @@
+<UserControl x:Class="HandyControlDemo.UserControl.PreviewSliderDemoCtl"
+             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:PreviewSlider Name="PreviewSlider" Width="800" Value="500" Maximum="1000" VerticalAlignment="Center" Margin="32">
+            <controls:PreviewSlider.PreviewContent>
+                <Label Style="{StaticResource LabelPrimary}" Content="{Binding PreviewPosition,ElementName=PreviewSlider}" ContentStringFormat="{}{0:#0.0}"/>
+            </controls:PreviewSlider.PreviewContent>
+        </controls:PreviewSlider>
+    </controls:TransitioningContentControl>
+</UserControl>

HandyControlDemo/UserControl/Controls/PreviewSliderDemoCtl.xaml.cs

@@ -0,0 +1,11 @@
+// ReSharper disable once CheckNamespace
+namespace HandyControlDemo.UserControl
+{
+    public partial class PreviewSliderDemoCtl
+    {
+        public PreviewSliderDemoCtl()
+        {
+            InitializeComponent();
+        }
+    }
+}