From de19befe092bf445e3223d5683688c2f536b64e7 Mon Sep 17 00:00:00 2001
From: Rui Marinho <rui@mbprui.home>
Date: Thu, 8 May 2014 23:09:04 +0100
Subject: [PATCH] Adding Selection Change to RadioGroup

This would make it easier to access the value when it changes for any
grouped item.
---
 MonoTouch.Dialog/Elements.cs | 13 +++++++++++--
 Sample/DemoElementApi.cs     | 23 +++++++++++++++--------
 2 files changed, 26 insertions(+), 10 deletions(-)

diff --git a/MonoTouch.Dialog/Elements.cs b/MonoTouch.Dialog/Elements.cs
index 30aeb601..58f46a82 100644
--- a/MonoTouch.Dialog/Elements.cs
+++ b/MonoTouch.Dialog/Elements.cs
@@ -2459,12 +2459,21 @@ public Group (string key)
 	/// Captures the information about mutually exclusive elements in a RootElement
 	/// </summary>
 	public class RadioGroup : Group {
+
+		public Action<int> SelectionChanged { get; set;}
 		int selected;
 		public virtual int Selected {
 			get { return selected; }
-			set { selected = value; }
+			set { 
+				if (value != selected) {
+					selected = value;
+					if (SelectionChanged != null)
+						SelectionChanged (selected);
+				}
+
+			}
 		}
-		
+	
 		public RadioGroup (string key, int selected) : base (key)
 		{
 			this.selected = selected;
diff --git a/Sample/DemoElementApi.cs b/Sample/DemoElementApi.cs
index 127b3ebb..385ded77 100644
--- a/Sample/DemoElementApi.cs
+++ b/Sample/DemoElementApi.cs
@@ -84,27 +84,34 @@ RootElement CreateRoot ()
 		
 		RootElement CreateSoundSection ()
 		{
-			return new RootElement ("Sounds"){
+			return new RootElement ("Sounds") {
 				new Section ("Silent") {
 					new BooleanElement ("Vibrate", true),
 				},
 				new Section ("Ring") {
 					new BooleanElement ("Vibrate", true),
 					new FloatElement (null, null, 0.8f),
-					new RootElement ("Ringtone", new RadioGroup (0)){
-						new Section ("Custom"){
+					new RootElement ("Ringtone", new RadioGroup (0) { 
+						SelectionChanged = 
+							new Action<int> ((int obj) => { 
+								using (var msg = new UIAlertView ("RadioGroup",string.Format("you selected : {0}", obj), null, "Ok")){
+									msg.Show ();
+								}
+							})
+					}) {
+						new Section ("Custom") {
 							new RadioElement ("Circus Music"),
 							new RadioElement ("True Blood"),
 						},
-						new Section ("Standard"){
+						new Section ("Standard") {
 							from n in "Marimba,Alarm,Ascending,Bark,Xylophone".Split (',')
-								select (Element) new RadioElement (n)
+							select (Element)new RadioElement (n)
 						}
 					},
-					new RootElement ("New Text Message", new RadioGroup (3)){
-						new Section (){
+					new RootElement ("New Text Message", new RadioGroup (3)) {
+						new Section () {
 							from n in "None,Tri-tone,Chime,Glass,Horn,Bell,Eletronic".Split (',')
-								select (Element) new RadioElement (n)
+							select (Element)new RadioElement (n)
 						}
 					},
 					new BooleanElement ("New Voice Mail", false),