Can I advice to extend SearchBox or RadAutoCompleteBox control to write free text and open list box only if I digit a custom char like '@'? I am tinking a control like Post textbox in Facebook or in Twitter where I can digit text and, if I digit '@' char opens a list with all friends o mine. If you want extend more, it will be wonderful if you can associate more than one custom char and each custom char is associated to a different Data source. Example: - '@' to get products - '#' to get Customers - and so on... This SearchBox must can be multiline too. Thanks, Francesco.