如何在GridViewColumnHeader模板中访问文本框

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

public class MyGridViewColumnHeader : GridViewColumnHeader
{
    public MyGridViewColumnHeader()
    {
        Loaded += MyGridViewColumnHeader_Loaded;
    }

    private void MyGridViewColumnHeader_Loaded(object sender, RoutedEventArgs e)
    {
        // 在模板加载完成后，使用VisualTreeHelper类找到文本框
        TextBox textBox = FindChild<TextBox>(this, "PART_TextBox");
        if (textBox != null)
        {
            // 找到文本框后，可以进行相应的操作
            // 例如，设置文本框的样式、绑定数据等
        }
    }

    private static 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;
    }
}