C# Dependecy属性ICommand在嵌套控件中不起作用

我有一个具有DependecProperty的UserControl：

public static readonly DependencyProperty OpenCommandProperty =
        DependencyProperty.Register(
            "OpenCommand",
            typeof(ICommand),
            typeof(BaseRouteFlatView),
            new UIPropertyMetadata(null));

 public ICommand OpenCommand
 {
    get { return (ICommand)GetValue(OpenCommandProperty); }
    set { SetValue(OpenCommandProperty, value); }
 }

在Xaml中：

<UserControl x:Name="myUserControl">
    <StackPanel>
        <Button x:Name="first" Command="{Binding OpenCommand, ElementName=myUserControl}"/> <!--Command works-->
        <controls:DropDownButtonControl>
            <controls:DropDownButtonControl.DropDownContent>
                <Button x:Name="second" Command="{Binding OpenCommand, ElementName=myUserControl}"/>  <!--Command doesn't work-->
            </controls:DropDownButtonControl.DropDownContent>
        </controls:DropDownButtonControl>
    </StackPanel>
</abstractions:UserControlBase>

我必须为第二个按钮中的工作命令指定哪个源？

请尝试以下操作：

public UserControl()
{
    InitializeComponent();
    NameScope.SetNameScope(second, NameScope.GetNameScope(this));
}

---

可能重复。我已经看过这个主题。但它对我不起作用如果我想使用相对源而不是依赖属性，我应该怎么做？就像在DropDownButtonControl中一样，这种构造不起作用