Why not use boost::signals for your event interface. It is much better than hand-coded actions and listeners, since any type of function can handle an event. The technology is already in Boost so why re-invent the wheel. I would like to emphazise this. I use the boost signal library for handling

Hi, Edward Diener wrote: the tree view control and list view control events in an extension of the Zinc gui library. It works pretty well. Johannes