You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. 
The application contains a custom control that is used to display customer information. 
You discover that the custom control is not rendering correctly. 
You need to identify the WPF element that is causing the issue. You want to achieve this goal by using the minimum amount of administrative effort. 
What should you do?（）

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?（）