The thing is that when you are using the CAknview classses as your view class, instead of CCoeControl derived classes then and ONLY then you have to use CAknViewAppUi derived AppUi class, othervise you'll end up having problems.
From which the most common would be the problems on drawing the softkeys.
ok so taking the Settings List example providing elsewhere on this site. If i wanted to have the settings list pop up from a menu, how can this be done with no visible softkeys?
take a look at the settings list example provided in the series 60 SDK, at least it has the AppUI class as well as the View structure defined right.
In case you have modified the examples or are using some other example, then you propably need to either change the appUi class to be derived from right base class, or chnage your view structure to be right one to be used with your appui class.