HTML 5

http://code.google.com/p/box2dweb/downloads/list

http://www.html5cn.org/article-5149-1.html

http://www.html5cn.org/article-4978-1.html

http://www.codeproject.com/Articles/43074/WPF-Custom-ComboBox

http://www.codeproject.com/Articles/179149/Creating-a-Nullable-WPF-ComboBox

http://www.codeproject.com/Articles/14934/myComboBox

http://www.codeproject.com/Articles/42133/Multiple-Selection-ComboBox-for-Silverlight

http://www.codeproject.com/Tips/595936/Ownerdrawn-ComboBox-Example

 http://www.codeproject.com/Articles/563862/Multi-Select-ComboBox-in-WPF

 http://www.codeproject.com/Articles/187762/Tree-ComboBox-Control

 http://www.codeproject.com/Articles/17502/Simple-Popup-Control