Xaml 在Contextmenu上找不到RelativeSource属性

我的xaml中有以下上下文菜单：

<ContextMenu ItemsSource="{Binding RSPContextMenuCommands}">
                        <ContextMenu.ItemContainerStyle>
                            <Style TargetType="{x:Type MenuItem}">
                                <Setter Property="CommandParameter" Value="{Binding}" />
                                <Setter Property="Command" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type ContextMenu}}, Path=DataContext.ShowASPCommand}" />
                                <Style.Triggers>                          
                                    </DataTrigger>
                                    <DataTrigger Binding="{Binding SpName}" Value="ASP">
                                        <Setter Property="Header" Value="Show Additional Service Providers" />
                                        <Setter Property="Command" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type ContextMenu}}, Path=DataContext.TransferCommand}" />
                                    </DataTrigger>
                                </Style.Triggers>
                            </Style>
                        </ContextMenu.ItemContainerStyle>
                        <ContextMenu.ItemTemplate>
                            <DataTemplate>
                                <StackPanel Orientation="Horizontal">
                                    <TextBlock Margin="5,0,0,0" Text="{Binding RelativeSource={RelativeSource AncestorType={x:Type ContextMenu}}, Path=PhoneNumber, PresentationTraceSources.TraceLevel=High}" />
                                </StackPanel>
                            </DataTemplate>
                        </ContextMenu.ItemTemplate>
                    </ContextMenu>

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其中，RSPContextMenuCommands是Schedule（类）类型的集合。计划中有PhoneNumber属性。TransferCommand与声明RSPContextMenuCommand的级别相同。我收到的是ShowASPCommand和TransferCommand，但不是电话号码。我尝试了各种相对资源组合，但都不起作用。什么是合适的相对资源。还尝试了

RelativeSource={relativesourcefindancestor，AncestorType={x:Type ContextMenu}}，Path=PhoneNumber

解决方法。我将ItemTemplate移动到ItemContainerStyle上方

<ContextMenu ItemsSource="{Binding RSPContextMenuCommands}">
                        <ContextMenu.ItemTemplate>
                            <DataTemplate>
                                <StackPanel Orientation="Horizontal">
                                    <TextBlock Text="{Binding PhoneNumber}" />
                                </StackPanel>
                            </DataTemplate>
                        </ContextMenu.ItemTemplate>
                        <ContextMenu.ItemContainerStyle>
                            <Style TargetType="{x:Type MenuItem}">
                                Setter Property="Command" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type ContextMenu}}, Path=DataContext.ShowASPCommand, PresentationTraceSources.TraceLevel=High}" />
                                <Style.Triggers>
                                    <DataTrigger Binding="{Binding SpName}" Value="ASP">
                                     <Setter Property="Command" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type ContextMenu}}, Path=DataContext.TransferCommand}" />
                                    </DataTrigger>
                                </Style.Triggers>
                            </Style>
                        </ContextMenu.ItemContainerStyle>
                    </ContextMenu>

Setter Property=“Command”Value=“{Binding RelativeSource={RelativeSource AncestorType={x:Type ContextMenu}}，Path=DataContext.ShowASPCommand，presentationontracesources.TraceLevel=High}”/>

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但是，如果有任何人能为我提供有关相对资源方法的适当文档。我将非常感激。：-）

为TransferCommand定义RelativeSource后，我的绑定级别位于声明RSPContextMenuCommand的类中。我想再次进入RSPContextMenuCommand。请帮帮我。