方法：
///relate 表示组合控件的父控件，即最外层
///type 要查找的控件类型
///resElement 找到的控件
private void FindChildByType(DependencyObject relate, Type type, ref FrameworkElement resElement)
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(relate); i++)
{
var el = VisualTreeHelper.GetChild(relate, i) as FrameworkElement;
if (el.GetType() == type)
{
resElement = el;
return;
}
else
{
FindChildByType(el, type, ref resElement);
}
}
}
调用：
FrameworkElement efind = default(FrameworkElement);
FindChildByType(lbItem, typeof(TextBlock), ref efind);
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