Csharp 如何正确地将 IsPressed 属性绑定到我的命令参数

我制作了一个自定义按钮，将命令绑定到(自定义，路由)IsPressedChanged事件，以便在按下按钮和释放按钮时执行命令:

<local:CustomButton xmlns:i="http://schemas.microsoft.com/xaml/behaviors" x:Name="MyButton">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="CustomIsPressedChanged">
            <i:InvokeCommandAction Command="{Binding Path=SomeCommand}"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>
</local:CustomButton>

使用自定义按钮实现:

public partial class CustomButton : Button
    {
        /* Register a custom routed event using the bubble routing strategy. */
        public static readonly RoutedEvent CustomIsPressedChangedEvent = EventManager.RegisterRoutedEvent(
            name: "CustomIsPressedChanged",
            routingStrategy: RoutingStrategy.Bubble,
            handlerType: typeof(RoutedEventHandler),
            ownerType: typeof(CustomButton));

        /* Provide CLR accessors for assigning an event handler. */
        public event RoutedEventHandler CustomIsPressedChanged
        {
            add { AddHandler(CustomIsPressedChangedEvent, value); }
            remove { RemoveHandler(CustomIsPressedChangedEvent, value); }
        }

        public CustomButton() { InitializeComponent(); }

        /* Custom Event handling of the IsPressedChanged event */
        protected override void OnIsPressedChanged(System.Windows.DependencyPropertyChangedEventArgs e)
        {
            /* Call the base class OnIsPressedChanged() method so IsPressedChanged event subscribers are notified. */
            base.OnIsPressedChanged(e);

            /* Raise custom event */
            RaiseEvent(new RoutedEventArgs(routedEvent: CustomIsPressedChangedEvent));
        }
    }

这本应该是完美的.

And now comes the Problem:

当我try 将IsPressed属性的值传播到命令时，如下所示:

<i:InvokeCommandAction Command="{Binding Path=SomeCommand}"
                       CommandParameter="{Binding ElementName=MyButton, Path=IsPressed}"/>

传播的值(似乎)始终是旧值IsPressed.当我按下按钮时，调用的命令参数为false，当我松开按钮时，参数为true.But当我在事件处理程序CustomButton.OnIsPressedChanged()中判断值IsPressed时，它表示预期的新值.

My Question is:我应该如何传播IsPressed的值以获得正确的值？是否保证总是使用旧值调用该命令？在这种情况下，我可以简单地反转值，但这对我来说似乎有点可疑，我真的不想这样做，除非我知道它将始终产生正确的结果.