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Create and return the view hierarchy used to show candidates. This will be called once, when the candidates are first displayed. You can return null to have no candidates view; the default implementation returns null.
To control when the candidates view is displayed, use InputMethodService.SetCandidatesViewShown(bool). To change the candidates view after the first one is created by this function, use InputMethodService.SetCandidatesView(Android.Views.View).