how-to-create-usercontrol.md

-유저 컨트롤 만들기
+WPF UserControl 만드는 방법 
 
 - http://www.codeproject.com/Articles/32825/How-to-Creating-a-WPF-User-Control-using-it-in-a-W
 - http://www.tutorialspoint.com/wpf/wpf_custom_controls.htm
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