效果图：
下载：Code
参考：
http://www.codeproject.com/Articles/33001/WPF-A-Simple-Color-Picker-With-Preview
http://www.codeproject.com/Articles/229442/WPF-Color-Picker-VS2010-Style
http://www.codeproject.com/Articles/52795/WPF-Color-Picker-Like-Office-2007
"{x:Static SystemColors.WindowBrush}"
