diff --git a/src/TestStack.White.UITests/MessageBoxTests.cs b/src/TestStack.White.UITests/MessageBoxTests.cs
index c41191d5..cee46f21 100644
--- a/src/TestStack.White.UITests/MessageBoxTests.cs
+++ b/src/TestStack.White.UITests/MessageBoxTests.cs
@@ -14,6 +14,15 @@ public MessageBoxTests(WindowsFramework framework)
         {
         }
 
+        [Test]
+        public void IsClosedTest()
+        {
+            MainWindow.Get<Button>("OpenMessageBox").Click();
+            var messageBox = MainWindow.MessageBox("Test message box");
+            Assert.That(messageBox.IsClosed, Is.False);
+            messageBox.Close();
+            Assert.That(messageBox.IsClosed, Is.True);
+        }
         [Test]
         public void CloseMessageBoxTest()
         {