As everyone seem ok with `changeDisplay()` I'll change for that one. 

For the events jQueryM has two events `pagebeforehide` and `pagebeforeshow` but they do provide a full set of events at jQM level while we said that delite won't provide the full "application framework" infrastructure (and dapp will do it). So I'm not sure the comparison is good here. dapp will provide those kind of things but that even here is for more for app framework type of code than end user and having two events will make things more complicated for app frameworks. What about `delite-display-before-change`?