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.