From f08d4ddb73bec838ddd5ba866d955fe46b516a13 Mon Sep 17 00:00:00 2001
From: brianlagunas_cp <XceedBoucherS@users.noreply.github.com>
Date: Tue, 9 Aug 2011 18:21:21 +0000
Subject: [PATCH] MessageBox: fixed issue where it is possible for the button
 in the click event handler to be null.

---
 .../MessageBox/Implementation/MessageBox.cs                   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/MessageBox/Implementation/MessageBox.cs b/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/MessageBox/Implementation/MessageBox.cs
index 0834679e..b820aee1 100644
--- a/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/MessageBox/Implementation/MessageBox.cs
+++ b/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/MessageBox/Implementation/MessageBox.cs
@@ -512,6 +512,10 @@ namespace Microsoft.Windows.Controls
         private void Button_Click(object sender, RoutedEventArgs e)
         {
             Button button = e.OriginalSource as Button;
+
+            if (button == null)
+                return;
+
             switch (button.Name)
             {
                 case "PART_NoButton":