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http://www.codeproject.com/Articles/24681/WPF-Diagram-Designer-Part-4

http://www.evget.com/product/354

http://www.mindfusion.eu/download-net.html

http://www.evget.com/article/2013/9/23/19676.html

http://blog.csdn.net/u010270807/article/details/8925879