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why a Slider in menu can not Binding Background.Opacity of layoutRoot,but grdPopupMenu(a grid control)can

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hi,i have a issue,but my english is ugly. why a Slider in menu can not Binding Background.Opacity of layoutRoot,but grdPopupMenu(a grid control)can you know i want to change the Background.Opacity of layoutRoot the main code as follow xaml: <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="PopupMenuApp.UserControl2" d:DesignWidth="640" d:DesignHeight="480" xmlns:my="clr-namespace:SL4PopupMenu;assembly=SL4PopupMenu" > <Grid x:Name="LayoutRoot" Background="#FFCB6969"> <Rectangle Fill="#FFF4F4F5" Height="98" Margin="146,108,182,0" Stroke="Black" VerticalAlignment="Top"/> <my:PopupMenu x:Name="pmMain" RightClickElements="LayoutRoot" AccessShortcut="Ctrl+Alt+M" AccessShortcutTargetElementName="LayoutRoot" > <!--The ItemsControl can also be placed inside a Grid or any other FrameworkElement within the menu--> <!--In this case the PopupMenu will use the first ItemsControl(lstPopupMenu in our case) it finds in its content--> <Grid x:Name="grdPopupMenu" Background="#FFB01C99" > <!--See code behind where more items are added to this listbox --> <ListBox x:Name="lstPopupMenu" Margin="20,0,0,0" > <my:PopupMenuItem x:Name="pmiCut" Header="Cut" Tag="ClipboardMenuTag" ImageSource="../images/Cut.png" /> <my:PopupMenuItem x:Name="pmiCopy" Header="Copy" Tag="ClipboardMenuTag" ImageSource="../images/Copy.png" /> <!--This implementation provides control over the header content--> <my:PopupMenuItem x:Name="pmiPaste" ImageSource="../images/Paste.png"> <TextBlock Text="Paste" Tag="ClipboardMenuTag"/> </my:PopupMenuItem > <my:PopupMenuSeparator Tag="ClipboardMenuTag"/> <my:PopupMenuItem x:Name="pmiOrientableMenu" Header="Orientable Menu" CloseOnClick="False" ImageSource="../images/4_direction.png" ImageRightSource="../images/arrow.png" /> <my:PopupMenuSeparator/> </ListBox> </Grid> </my:PopupMenu> <Slider x:Name="stpTransparency" Height="35" VerticalAlignment="Center" Value="{Binding Background.Opacity, ElementName=grdPopupMenu, Mode=TwoWay}" Maximum="1" HorizontalAlignment="Center" Width="200"/> </Grid> </UserControl> csharp code behind: using System; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Ink; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; namespace PopupMenuApp { public partial class UserControl2 : UserControl { public UserControl2() { // 为初始化变量所必需 InitializeComponent(); pmMain.AddItem(stpTransparency).CloseOnClick = false; } } }

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