You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You discover that when the application runs, a user control is not rendered correctly. You need to find out the user interface (UI) element of the window that is causing the rendering problem. What should you do?（）

• A、 Use the Local Window.
• B、 Use the WPF Visualizer.
• C、 Generate a trace log by using IntelliTrace.
• D、 Set a breakpoint at the control. Run the application.