WPF中ItemsControl应用虚拟化时找到子元素的方法

E:\Personal\WPF\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.exe E:\Personal\WPF\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.pdb E:\Personal\WPF\WpfApplication1\WpfApplication1\obj\Debug\MainWindow.baml E:\Personal\WPF\WpfApplication1\WpfApplication1\obj\Debug\MainWindow.g.cs E:\Personal\WPF\WpfApplication1\WpfApplication1\obj\Debug\App.g.cs E:\Personal\WPF\WpfApplication1\WpfApplication1\obj\Debug\GeneratedInternalTypeHelper.g.cs E:\Personal\WPF\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1_MarkupCompile.cache E:\Personal\WPF\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1_MarkupCompile.lref E:\Personal\WPF\WpfApplication1\WpfApplication1\obj\Debug\App.baml E:\Personal\WPF\WpfApplication1\WpfApplication1\obj\Debug\SampleData\SampleDataSource\SampleDataSource.baml E:\Personal\WPF\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.g.resources E:\Personal\WPF\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.exe E:\Personal\WPF\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.pdb