[DropdownList] Add missing document for Event

Change-Id: Idcd30fc3492b3b38bb635b84e97252728f9fb616

diff --git a/Tizen.Xamarin.Forms.Extension/DropdownList.cs b/Tizen.Xamarin.Forms.Extension/DropdownList.cs
index ac771da..80d9107 100755 (executable)
--- a/Tizen.Xamarin.Forms.Extension/DropdownList.cs
+++ b/Tizen.Xamarin.Forms.Extension/DropdownList.cs
@@ -38,6 +38,9 @@ namespace Tizen.Xamarin.Forms.Extension
 
         public static readonly BindableProperty DisplayMemberPathProperty = BindableProperty.Create("DisplayMemberPath", typeof(string), typeof(DropdownList), default(string), propertyChanged: OnDisplayMemberPathChanged);
 
+        /// <summary>\r
+        /// Occurs when an item in the DropdownList is selected.\r
+        /// </summary>
         public event EventHandler<SelectedItemChangedEventArgs> ItemSelected;
 
         internal IEnumerable InternalItems => _items;