add slider style

HandyControlDemo/UserControl/Main/LeftMainContent.xaml

@@ -45,6 +45,11 @@
                         <Image Source="../../Resources/Img/LeftMainContent/ScrollBox_16x.png"/>
                     </controls:EdgeElement.LeftContent>
                 </ListBoxItem>
+                <ListBoxItem Style="{StaticResource ListBoxItemNew}" Tag="{x:Static data:MessageToken.SliderDemoCtl}" Content="{x:Static langs:Lang.Slider}">
+                    <controls:EdgeElement.LeftContent>
+                        <Image Source="../../Resources/Img/LeftMainContent/Slider_16x.png"/>
+                    </controls:EdgeElement.LeftContent>
+                </ListBoxItem>
                 <ListBoxItem Tag="{x:Static data:MessageToken.TextBlockDemoCtl}" Content="{x:Static langs:Lang.TextBlock}">
                     <controls:EdgeElement.LeftContent>
                         <Image Source="../../Resources/Img/LeftMainContent/TextBlock_16x.png"/>

HandyControlDemo/UserControl/Main/NoUserContent.xaml

@@ -2,7 +2,6 @@
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
       xmlns:interactivity="clr-namespace:HandyControl.Interactivity;assembly=HandyControl"
-      DataContext="{Binding NoUserContent,Source={StaticResource Locator}}"
       xmlns:langs="clr-namespace:HandyControlDemo.Properties.Langs"
       Height="28"
       xmlns:controls="clr-namespace:HandyControl.Controls;assembly=HandyControl"