C# WPF DataGrid中的非活动上下文菜单

我有一个从datagrid继承的usercontorol VariableGrid

    <vg:VariableGrid ItemsSource="{Binding Items, Mode=TwoWay}">
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding Name}" Header="Name"/>               
            <DataGridTextColumn Binding="{Binding Value}" Header="Value"/>
        </DataGrid.Columns>
    </vg:VariableGrid>

当DataGrid为空时，右键单击在上下文菜单中显示禁用的命令。因此，我无法在我的上下文菜单中执行任何操作

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你能帮我解决我的问题吗？

看这个谢谢，这帮了我。

<Style TargetType="{x:Type vg:VariableGrid}">
    <Setter Property="CanUserAddRows" Value="false" />
    <Setter Property="CanUserDeleteRows" Value="false" />
    <Setter Property="ContextMenu" Value="{StaticResource VariableGridContextMenu}" />
</Style>

<ContextMenu x:Key="VariableGridContextMenu">
    <MenuItem Header="Add variable" Command="{x:Static vg:VariableGrid.AddRowCommand}"/>
    <MenuItem Header="Delete" Command="{x:Static ApplicationCommands.Delete}"/>
</ContextMenu>

public partial class VariableGrid : DataGrid, INotifyPropertyChanged 
{
    public static RoutedCommand AddRowCommand = new RoutedCommand();
    private void InitCommands()
    {
        this.CommandBindings.Add(new CommandBinding(VariableGrid.AddRowCommand, AddRow)); 
        this.CommandBindings.Add(new CommandBinding(ApplicationCommands.Delete, RemoveRow, CanRemoveRow)); 
    }

    private void AddRow(object sender, ExecutedRoutedEventArgs e)
    {
    …
    }
    private void RemoveRow(object sender, ExecutedRoutedEventArgs e)
    {
        …
    }

    private void CanRemoveRow(object sender, CanExecuteRoutedEventArgs e)
    {
        e.CanExecute = (SelectedItems.Count > 0);
    }
}