Combo box with intellisense in Silverlight 4

Question

Hi,

  I have a combo box with list of countries. when the user select it and press any key inside the combo box it has to display the information that contains the key value. For example if the user Press "I" it has to display "India,Ireland" etc.., Basically its like a auto complete text box with intellisense. But i need to for Combo Box. I tried with auto complete text box. but i need it as Combo Box. Please help.


Thanks,
Vijay