FModel/FModel/Extensions/VisualTreeExtensions.cs

using System.Windows;
using System.Windows.Media;

namespace FModel.Extensions;

public static class VisualTreeExtensions
{
    public static T FindAncestor<T>(this DependencyObject current) where T : DependencyObject
    {
        while (current != null)
        {
            if (current is T t)
                return t;
            current = current is FrameworkContentElement contentElement
                ? contentElement.Parent
                : VisualTreeHelper.GetParent(current);
        }
        return null;
    }

    public static T? FindVisualChild<T>(this DependencyObject parent) where T : DependencyObject
    {
        for (var i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
        {
            var child = VisualTreeHelper.GetChild(parent, i);
            if (child is T result)
                return result;

            if (FindVisualChild<T>(child) is { } descendant)
                return descendant;
        }

        return null;
    }

}