Index: Core/Common/test/Core.Common.Gui.Test/Forms/MessageWindow/MessageWindowTest.cs
===================================================================
diff -u -rd3799a1c82bea28251025ee283caffe44e27313a -r87dd149e8e84e23ff619cbdf7e5b6e9f710ee0e4
--- Core/Common/test/Core.Common.Gui.Test/Forms/MessageWindow/MessageWindowTest.cs	(.../MessageWindowTest.cs)	(revision d3799a1c82bea28251025ee283caffe44e27313a)
+++ Core/Common/test/Core.Common.Gui.Test/Forms/MessageWindow/MessageWindowTest.cs	(.../MessageWindowTest.cs)	(revision 87dd149e8e84e23ff619cbdf7e5b6e9f710ee0e4)
@@ -225,7 +225,7 @@
 
                 // Call
                 gridView.FireEvent("CellMouseDoubleClick", new DataGridViewCellMouseEventArgs(
-                                                               0, 0, 0, 0, 
+                                                               0, 0, 0, 0,
                                                                new MouseEventArgs(MouseButtons.Left, 1, 0, 0, 0)));
 
                 // Assert
@@ -298,6 +298,155 @@
             mocks.VerifyAll();
         }
 
+        [Test]
+        public void ButtonClearAll_Click_RemovesAllMessages()
+        {
+            // Setup
+            using (var form = new Form())
+            using (GuiFormsMessageWindow.MessageWindow messageWindow = ShowMessageWindow(null))
+            {
+                form.Controls.Add(messageWindow);
+                form.Show();
+
+                messageWindow.AddMessage(Level.Warn, new DateTime(), "message");
+                messageWindow.Refresh();
+                var dataGridView = (DataGridView) new ControlTester("messagesDataGridView").TheObject;
+                dataGridView.CurrentCell = dataGridView.Rows[0].Cells[0];
+
+                var button = new ToolStripItemTester("buttonClearAll");
+
+                // Call
+                button.Click();
+
+                // Assert
+                Assert.AreEqual(0, dataGridView.Rows.Count);
+            }
+        }
+
+        [Test]
+        [STAThread]
+        public void ButtonCopy_Click_CopiesContentToClipboard()
+        {
+            // Setup
+            using (var form = new Form())
+            using (GuiFormsMessageWindow.MessageWindow messageWindow = ShowMessageWindow(null))
+            {
+                form.Controls.Add(messageWindow);
+                form.Show();
+
+                messageWindow.AddMessage(Level.Warn, new DateTime(), "message");
+                messageWindow.Refresh();
+                var dataGridView = (DataGridView) new ControlTester("messagesDataGridView").TheObject;
+                dataGridView.CurrentCell = dataGridView.Rows[0].Cells[0];
+
+                var button = new ToolStripItemTester("buttonCopy");
+
+                // Call
+                button.Click();
+                
+                // Assert
+                IDataObject actualDataObject = Clipboard.GetDataObject();
+                Assert.IsTrue(actualDataObject != null && actualDataObject.GetDataPresent(DataFormats.Text));
+                var actualContent = (string) actualDataObject.GetData(DataFormats.Text);
+                Assert.AreEqual("\t00:00:00\tmessage", actualContent);
+            }
+        }
+
+        [Test]
+        public void ButtonShowInfo_Click_FiltersInfoMessages()
+        {
+            // Setup
+            using (var form = new Form())
+            using (GuiFormsMessageWindow.MessageWindow messageWindow = ShowMessageWindow(null))
+            {
+                form.Controls.Add(messageWindow);
+                form.Show();
+
+                AddMessages(messageWindow);
+                var dataGridView = (DataGridView) new ControlTester("messagesDataGridView").TheObject;
+                dataGridView.CurrentCell = dataGridView.Rows[0].Cells[0];
+
+                var button = new ToolStripButtonTester("buttonShowInfo");
+
+                // Call
+                button.Click();
+
+                // Assert
+                Assert.AreEqual(2, dataGridView.Rows.Count);
+                var filteredLevel = Level.Info.ToString();
+                foreach (DataGridViewRow row in dataGridView.Rows)
+                {
+                    Assert.AreNotEqual(filteredLevel, row.Cells[0].Value.ToString());
+                }
+            }
+        }
+
+        [Test]
+        public void ButtonShowWarn_Click_FiltersWarningMessages()
+        {
+            // Setup
+            using (var form = new Form())
+            using (GuiFormsMessageWindow.MessageWindow messageWindow = ShowMessageWindow(null))
+            {
+                form.Controls.Add(messageWindow);
+                form.Show();
+
+                AddMessages(messageWindow);
+                var dataGridView = (DataGridView) new ControlTester("messagesDataGridView").TheObject;
+                dataGridView.CurrentCell = dataGridView.Rows[0].Cells[0];
+
+                var button = new ToolStripButtonTester("buttonShowWarning");
+
+                // Call
+                button.Click();
+
+                // Assert
+                Assert.AreEqual(2, dataGridView.Rows.Count);
+                var filteredLevel = Level.Warn.ToString();
+                foreach (DataGridViewRow row in dataGridView.Rows)
+                {
+                    Assert.AreNotEqual(filteredLevel, row.Cells[0].Value.ToString());
+                }
+            }
+        }
+
+        [Test]
+        public void ButtonShowError_Click_FiltersErrorMessages()
+        {
+            // Setup
+            using (var form = new Form())
+            using (GuiFormsMessageWindow.MessageWindow messageWindow = ShowMessageWindow(null))
+            {
+                form.Controls.Add(messageWindow);
+                form.Show();
+
+                AddMessages(messageWindow);
+                var dataGridView = (DataGridView) new ControlTester("messagesDataGridView").TheObject;
+                dataGridView.CurrentCell = dataGridView.Rows[0].Cells[0];
+
+                var button = new ToolStripButtonTester("buttonShowError");
+
+                // Call
+                button.Click();
+
+                // Assert
+                Assert.AreEqual(2, dataGridView.Rows.Count);
+                var filteredLevel = Level.Error.ToString();
+                foreach (DataGridViewRow row in dataGridView.Rows)
+                {
+                    Assert.AreNotEqual(filteredLevel, row.Cells[0].Value.ToString());
+                }
+            }
+        }
+
+        private static void AddMessages(GuiFormsMessageWindow.MessageWindow messageWindow)
+        {
+            messageWindow.AddMessage(Level.Info, new DateTime(), "Info message");
+            messageWindow.AddMessage(Level.Warn, new DateTime(), "Warn message");
+            messageWindow.AddMessage(Level.Error, new DateTime(), "Error message");
+            messageWindow.Refresh();
+        }
+
         private GuiFormsMessageWindow.MessageWindow ShowMessageWindow(IWin32Window dialogParent)
         {
             var logAppender = new GuiFormsMessageWindow.MessageWindowLogAppender();