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copied!<p>svn!</p> <p>Here is my solution</p> <pre><code>public class CustomRootElement : RootElement { private RadioGroup _defaultGroup = new RadioGroup(0); private Dictionary<string, RadioGroup> _groups = new Dictionary<string, RadioGroup>(); public CustomRootElement(string caption = "") : base(caption , new RadioGroup("default",0)) { } public CustomRootElement(string caption, Group group, Func<RootElement, UIViewController> createOnSelected) : base(caption, group) { var radioGroup = group as RadioGroup; if(radioGroup != null) { _groups.Add(radioGroup.Key.ToLower(), radioGroup); } this.createOnSelected = createOnSelected; } public override UITableViewCell GetCell(UITableView tv) { var cell = base.GetCell(tv); cell.SelectionStyle = UITableViewCellSelectionStyle.None; return cell; } public int Selected(string group) { if (string.IsNullOrEmpty(group)) { throw new ArgumentNullException("group"); } group = group.ToLower(); if (_groups.ContainsKey(group)) { return _groups[group].Selected; } return 0; } public void Select(string group, int selected) { if (string.IsNullOrEmpty(group)) { throw new ArgumentNullException("group"); } var radioGroup = GetGroup(group); radioGroup.Selected = selected; } internal RadioGroup GetGroup(string group) { if (string.IsNullOrEmpty(group)) { throw new ArgumentNullException("group"); } group = group.ToLower(); if (!_groups.ContainsKey(group)) { _groups[group] = new RadioGroup(group , 0); } return _groups[group]; } internal NSIndexPath PathForRadioElement(string group, int index) { foreach (var section in this) { foreach (var e in section.Elements) { var re = e as SlRadioElement; if (re != null && string.Equals(re.Group, group,StringComparison.InvariantCultureIgnoreCase) && re.Index == index) { return e.IndexPath; } } } return null; } } public class CustomRadioElement : RadioElement { public event Action<CustomRadioElement> ElementSelected; private readonly static NSString ReuseId = new NSString("CustomRadioElement"); private string _subtitle; public int? Index { get; protected set; } public CustomRadioElement(string caption, string group = null, string subtitle = null) :base(caption, group) { _subtitle = subtitle; } protected override NSString CellKey { get { return ReuseId; } } public override UITableViewCell GetCell(UITableView tv) { EnsureIndex(); var cell = tv.DequeueReusableCell(CellKey); if (cell == null) { cell = new UITableViewCell(UITableViewCellStyle.Subtitle , CellKey); } cell.ApplyStyle(this); cell.TextLabel.Text = Caption; if (!string.IsNullOrEmpty(_subtitle)) { cell.DetailTextLabel.Text = _subtitle; } var selected = false; var slRoot = Parent.Parent as CustomRootElement; if (slRoot != null) { selected = Index == slRoot.Selected(Group); } else { var root = (RootElement)Parent.Parent; selected = Index == root.RadioSelected; } cell.Accessory = selected ? UITableViewCellAccessory.Checkmark : UITableViewCellAccessory.None; return cell; } public override void Selected(DialogViewController dvc, UITableView tableView, NSIndexPath indexPath) { var slRoot = Parent.Parent as CustomRootElement; if (slRoot != null) { var radioGroup = slRoot.GetGroup(Group); if (radioGroup.Selected == Index) { return; } UITableViewCell cell; var selectedIndex = slRoot.PathForRadioElement(Group, radioGroup.Selected); if (selectedIndex != null) { cell = tableView.CellAt(selectedIndex); if (cell != null) { cell.Accessory = UITableViewCellAccessory.None; } } cell = tableView.CellAt(indexPath); if (cell != null) { cell.Accessory = UITableViewCellAccessory.Checkmark; } radioGroup.Selected = Index.Value; var handler = ElementSelected; if (handler != null) { handler(this); } } else { base.Selected(dvc, tableView, indexPath); } } private void EnsureIndex() { if (!Index.HasValue) { var parent = Parent as Section; Index = parent.Elements.IndexOf(this); } } } </code></pre> <p>Hope this help!</p>

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