RadComboBox AutoComplete Hightlight Keyword?

RadComboBox is a good control to use for auto-suggestion/type-head/auto-complete, the only thing is when using webservice to get the item, the client template is pre-defined and can not be customized. However, we do find hightlighting the keyword in the auto-complete item list is really important for user experience. Because that tells the user visiually why certern items are suggested. The question is how can we do that? Here comes the solution...