The UISearchBar has an event that fires when a scope button changes.  Here
are some snippets, "this" is a DialogViewController that has the SearchBar
exposed per my post above:

        public enum SearchScope
        {
                All,
                Subject,
                From,
                Advanced
        }

                public override void ViewDidLoad ()
                {
                        this.SearchBar.SelectedScopeButtonIndexChanged += 
ScopeButtonChanged;
                        base.ViewDidLoad ();
                }

                private void ScopeButtonChanged(object sender, System.EventArgs 
args)
                {
                        // Search scope has changed
                        searchScope = 
(SearchScope)this.SearchBar.SelectedScopeButtonIndex;
                }


Ray




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