WPF Custom Control Design question

I have a design question开发者_如何学运维:

If you had to make a WPF Combobox with search support, (= combobox that shows a popup with some Buttons, Search TextBox, List.. etc the selected item feed to the default's ComboBox TextBox.) What would you do?

1. Write a custom control (diretly inheriting from System.Windows.Control)
2. Write a custom control inheritnig from Selector / ComboBox
3. Make a UserControl
4. Use a default ComboBox with a 'special Template' (CotnrolTemplate/Style ?) extended to search functionality
5. Use a default ComboBox with style and attached EventHandlers..

Thank you guys !

I have done that, and the method i used was option 2 - i did a template control inheriting from a third party combo, and replaced the popup contents with my own template.