Strange. Note that you can add events by right clicking on the views.
Does it always open like this? Are you using Windows XP?
I'm using Windows 7 Enterprise 64bit, Service Pack1
First time, i can select events for adding as Subs, but, then i can not
I know, i can add events by right clicking on the views, but user Generate Members tool allow full events, eg: UP event in Button view.