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