如何重写Xceed.Wpf.AvalonDock LayoutItem在Header右键菜单的关闭命令

定义资源：

 <ResourceDictionary>
    <xcad:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter" />
    <ContextMenu x:Key="DocumentContextMenu">
        <MenuItem Command="{Binding Path=Model.CloseCommand}" Visibility="{Binding Path=IsEnabled, RelativeSource={RelativeSource Self}, Mode=OneWay, Converter={StaticResource BoolToVisibilityConverter}}">
            <MenuItem.HeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="关闭" />
                </DataTemplate>
            </MenuItem.HeaderTemplate>
        </MenuItem>
....

完整代码：

<xcad:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter" />
    <ContextMenu x:Key="DocumentContextMenu">
        <MenuItem Command="{Binding Path=CloseCommand}" Visibility="{Binding Path=IsEnabled, RelativeSource={RelativeSource Self}, Mode=OneWay, Converter={StaticResource BoolToVisibilityConverter}}">
            <MenuItem.HeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="关闭" />
                </DataTemplate>
            </MenuItem.HeaderTemplate>
        </MenuItem>
        <MenuItem Command="{Binding Path=CloseAllButThisCommand}">
            <MenuItem.HeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="除此之外全部关闭" />
                </DataTemplate>
            </MenuItem.HeaderTemplate>
        </MenuItem>

        <MenuItem Command="{Binding Path=CloseAllCommand}">
            <MenuItem.HeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="全部关闭" />
                </DataTemplate>
            </MenuItem.HeaderTemplate>
        </MenuItem>
        <MenuItem Command="{Binding Path=FloatCommand}">
            <MenuItem.HeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="漂浮" />
                </DataTemplate>
            </MenuItem.HeaderTemplate>
        </MenuItem>
        <MenuItem Command="{Binding Path=DockAsDocumentCommand}">
            <MenuItem.HeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="停靠成标签式文档" />
                </DataTemplate>
            </MenuItem.HeaderTemplate>
        </MenuItem>
        <MenuItem Command="{Binding Path=NewHorizontalTabGroupCommand}" Visibility="{Binding Path=IsEnabled, RelativeSource={RelativeSource Self}, Mode=OneWay, Converter={StaticResource BoolToVisibilityConverter}}">
            <MenuItem.Icon>
                <Image Source="Images/HTabGroup.png" Stretch="Uniform" Width="14" />
            </MenuItem.Icon>
            <MenuItem.HeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="新建水平标签分组" />
                </DataTemplate>
            </MenuItem.HeaderTemplate>
        </MenuItem>

        <MenuItem Command="{Binding Path=NewVerticalTabGroupCommand}" Visibility="{Binding Path=IsEnabled, RelativeSource={RelativeSource Self}, Mode=OneWay, Converter={StaticResource BoolToVisibilityConverter}}">
            <MenuItem.Icon>
                <Image Source="Images/VTabGroup.png" Stretch="Uniform" Width="14" />
            </MenuItem.Icon>
            <MenuItem.HeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="新建垂直标签分组" />
                </DataTemplate>
            </MenuItem.HeaderTemplate>
        </MenuItem>
        <MenuItem Command="{Binding Path=MoveToNextTabGroupCommand}" Visibility="{Binding Path=IsEnabled, RelativeSource={RelativeSource Self}, Mode=OneWay, Converter={StaticResource BoolToVisibilityConverter}}">
            <MenuItem.HeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="移动到下一个标签组" />
                </DataTemplate>
            </MenuItem.HeaderTemplate>
        </MenuItem>
        <MenuItem Command="{Binding Path=MoveToPreviousTabGroupCommand}" Visibility="{Binding Path=IsEnabled, RelativeSource={RelativeSource Self}, Mode=OneWay, Converter={StaticResource BoolToVisibilityConverter}}">
            <MenuItem.HeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="移动到上一个标签组" />
                </DataTemplate>
            </MenuItem.HeaderTemplate>
        </MenuItem>
    </ContextMenu>

 注意这里的Model.CloseCommand的Model其实是DockingManager的DocumentsSource集合中的一项，该项对应一个含有CloseCommand属性的类实例，这样写其实就相当于覆盖掉原有CloseCommand

<xcad:DockingManager x:Name="dockingManager"
      AllowMixedOrientation="True"
      DocumentContextMenu="{StaticResource DocumentContextMenu}"
      BorderBrush="Black"
      FontFamily="Microsoft YaHei"
      DocumentClosing="dockingManager_OnDocumentClosing"
      DocumentsSource="{Binding Path=PanelsModel.Panels}"
      BorderThickness="1">

如DocumentContextMenu="{StaticResource DocumentContextMenu}"所示，直接指定DocumentContextMenu就ok了。

写得有点乱，权当是个简记。