如何从选项卡项wpf数据模板中查找控件

public 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);
        if (child is T childType && (child as FrameworkElement)?.Name == childName)
        {
            foundChild = childType;
            break;
        }
        else
        {
            foundChild = FindChild<T>(child, childName);
            if (foundChild != null)
                break;
        }
    }
    return foundChild;
}

var tabControl = FindChild<TabControl>(this, "TabControlName");
var dataTemplate = tabControl.ItemTemplate;

var tabItem = tabControl.SelectedItem as TabItem;
var contentPresenter = FindChild<ContentPresenter>(tabItem, "ContentPresenterName");
var contentContainer = contentPresenter.ContentTemplateRoot;

var targetControl = FindChild<ControlType>(contentContainer, "ControlName");