You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You want the application to contain a window as shown in the following exhibit. The application contains the following code fragment. (Line numbers are included for reference only.) 
You need to create the application window. Which code fragment should you insert at line 12?（）
- A、
- B、
- C、
- D、
正确答案:C
答案解析:有
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