Silverlight combobox acting like menu

I want to modify silverlight combobox behavior. I want to open dropdown by mouse entering to combobox but not clicking, that iseasy to d开发者_如何学运维o when handling MouseEnter event and seting IsDropDownOpen property to true. But the issue is how to close dropdown when mouse leaves dropdown area and combo itself. Any suggestions. Thanks.

My suggestion is that you use Expander from Silverlight Toolkit with ItemsControl

Video: http://www.silverlight.net/learn/creating-ui/control-basics/silverlight-toolkit-creating-a-toolkit-expander