如何在不创建覆盖IsEnabledCore的新类的情况下启用添加到Richtextbox的按钮？

// 获取Richtextbox的按钮控件对象
Button addButton = FindChild<Button>(richtextbox, "AddButton");

// 启用按钮控件
addButton.IsEnabled = true;

// 递归查找子元素的方法
private T FindChild<T>(DependencyObject parent, string childName) where T : DependencyObject
{
    if (parent == null) return null;

    T foundChild = null;
    int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
    for (int i = 0; i < childrenCount; i++)
    {
        var child = VisualTreeHelper.GetChild(parent, i);
        T childType = child as T;
        if (childType == null)
        {
            foundChild = FindChild<T>(child, childName);
            if (foundChild != null) break;
        }
        else if (!string.IsNullOrEmpty(childName))
        {
            var frameworkElement = child as FrameworkElement;
            if (frameworkElement != null && frameworkElement.Name == childName)
            {
                foundChild = (T)child;
                break;
            }
        }
        else
        {
            foundChild = (T)child;
            break;
        }
    }
    return foundChild;
}