Spreadsheet-Document the new HyperlinkClicked event

Author: nade7o

controls/spreadsheet/events.md

@@ -154,13 +154,59 @@ End Sub
 
 * **ActivePresenterChanged**: Occurs when the active presenter is changed.
 
+* **HyperlinkClicked**: Occurs when a hyperlink in the document gets clicked. The event allows you to either cancel or replace the navigation logic. HyperlinkClicked event can be used as a confirmation from the end-user whether to proceed or not with opening a hyperlink due to security reasons. 
+
+#### Example 3: Using the HyperlinkClicked event to implement confirmation for the clicked links in the document
+
+{{source=..\SamplesCS\Spreadsheet\Events.cs region=HyperlinkClickedEvent}} 
+{{source=..\SamplesVB\Spreadsheet\Events.vb region=HyperlinkClickedEvent}}
+````C#
+private void ActiveWorksheetEditor_HyperlinkClicked(object sender, Telerik.WinControls.Hyperlinks.HyperlinkClickedEventArgs e)
+{
+    if (e.URL.EndsWith("exe"))
+    {
+        e.Handled = true;
+        MessageBoxResult Result = System.Windows.MessageBox.Show("You are about to open an executable file. Do you want to proceed?", "Possible unsafe link", MessageBoxButton.YesNo, MessageBoxImage.Question);
+
+        if (Result == MessageBoxResult.Yes)
+        {
+            Process.Start(new ProcessStartInfo()
+            {
+                FileName = e.URL,
+                UseShellExecute = true
+            });
+        }
+    }
+}
+
+````
+````VB.NET
+Private Sub ActiveWorksheetEditor_HyperlinkClicked(ByVal sender As Object, ByVal e As Telerik.WinControls.Hyperlinks.HyperlinkClickedEventArgs)
+    If e.URL.EndsWith("exe") Then
+        e.Handled = True
+        Dim Result As MessageBoxResult = System.Windows.MessageBox.Show("You are about to open an executable file. Do you want to proceed?", "Possible unsafe link", MessageBoxButton.YesNo, MessageBoxImage.Question)
+
+        If Result = MessageBoxResult.Yes Then
+            Process.Start(New ProcessStartInfo() With {
+                .FileName = e.URL,
+                .UseShellExecute = True
+            })
+        End If
+    End If
+End Sub
+
+```` 
+ 
+{{endregion}} 
+
+
 >The events related to selection in RadSpreadsheet are described in the [Working with UI Selection]({%slug radspreadsheet-ui-working-with-selection%}) topic.
 
 ## Cells Events
 
 * **CellPropertyChanged**: Occurs when a property of a cell is changed. The event arguments are of type **CellPropertyChangedEventArgs** and expose information about the exact property that was changed as well as the affected cell range. **Example 3** demonstrates how you can use the event to get a notification when the users change the fill of a cell.
 
-#### Example 3: Using the CellPropertyChangedEvent
+#### Example 4: Using the CellPropertyChangedEvent
 
 {{source=..\SamplesCS\Spreadsheet\Events.cs region=radspreadsheet-events_3}} 
 {{source=..\SamplesVB\Spreadsheet\Events.vb region=radspreadsheet-events_3}}