From what I can see (a lot;)) that is not a feature of either module. If you want to add such a feature, you will have to handle everything yourself (listening for events, deciding if to hilight, what to hilight, what to move where... see Tk::bind, Tk::bindtags)

MJD says you can't just make shit up and expect the computer to know what you mean, retardo! I run a Win32 PPM repository for perl 5.6x+5.8x. I take requests. ** The Third rule of perl club is a statement of fact: pod is sexy.