如何访问新创建的ItemsControl子控件？

int count = VisualTreeHelper.GetChildrenCount(itemsControl);
for (int i = 0; i < count; i++)
{
    DependencyObject child = VisualTreeHelper.GetChild(itemsControl, i);
    // 处理子元素
}

for (int i = 0; i < itemsControl.Items.Count; i++)
{
    var child = itemsControl.ItemContainerGenerator.ContainerFromIndex(i) as FrameworkElement;
    // 处理子元素
}

<ItemsControl ItemsSource="{Binding Items}">
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <!-- 定义子元素的外观 -->
            <Button Content="{Binding Name}" Click="Button_Click"/>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

private void Button_Click(object sender, RoutedEventArgs e)
{
    Button button = (Button)sender;
    // 处理子元素
}