Normally when I see this sort of thing happening its caused by a wrapping
uinavigationcontroller ot uitabbarcontroller - check out so - there are lots
of questions like
http://stackoverflow.com/questions/3560669/viewwillappear-viewdidappear-not-being-called-not-firing
Stuart
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yeah, maybe you could provide the code? gist.github.com
the MWC sample subclasses DialogViewController
https://github.com/xamarin/mobile-samples/blob/master/MWC/MWC.iOS/Screens/iPhone/UpdateManagerLoadingDialogViewController.cs
which is in turn subclassed