diff --git a/TermTk/TTkCore/log.py b/TermTk/TTkCore/log.py
index f3ec36c2..0db6bcb1 100644
--- a/TermTk/TTkCore/log.py
+++ b/TermTk/TTkCore/log.py
@@ -61,7 +61,7 @@ class TTkLog:
         log(f"{context.file}:{context.line} {message}")
 
     @staticmethod
-    def use_default_file_logging():
+    def use_default_file_logging(file="session.log"):
         logging.basicConfig(level=logging.DEBUG,
                     filename='session.log',
                     format='%(levelname)s:(%(threadName)-9s) %(message)s',)
diff --git a/tutorial/001-helloworld.md b/tutorial/001-helloworld.md
index 24269104..3f979142 100644
--- a/tutorial/001-helloworld.md
+++ b/tutorial/001-helloworld.md
@@ -11,7 +11,6 @@
 Following is the code to execute [Hello World program](helloworld/helloworld.001.py) in [pyTermTk](https://github.com/ceccopierangiolieugenio/pyTermTk) −
 
 ```python
-import sys, os
 import TermTk as ttk
 
 root = ttk.TTk()
@@ -32,7 +31,6 @@ The above code produces the following output
 Following is the code to execute [Hello World program](helloworld/helloworld.002.py) in [pyTermTk](https://github.com/ceccopierangiolieugenio/pyTermTk) −
 
 ```python
-import sys, os
 import TermTk as ttk
 
     # Create a root object (it is a widget that represent the terminal)
diff --git a/tutorial/002-layout.md b/tutorial/002-layout.md
index 3640cec9..41ce0b83 100644
--- a/tutorial/002-layout.md
+++ b/tutorial/002-layout.md
@@ -69,11 +69,42 @@ TTkGridLayout        ┌┐ columnMinWidth
 
 
 
-## Example 1 - Simple [TTkVBoxLayout](https://ceccopierangiolieugenio.github.io/pyTermTk/TTkLayouts/boxlayout.html#TermTk.TTkLayouts.boxlayout.TTkVBoxLayout)
-Following is the code to execute [VBox Example](layout/example1.simple.vbox.py) in [pyTermTk](https://github.com/ceccopierangiolieugenio/pyTermTk)
+## Example 1 - Simple [TTkLayout](https://ceccopierangiolieugenio.github.io/pyTermTk/TTkLayouts/layout.html#TermTk.TTkLayouts.layout.TTkLayout)
+Following is the code to execute [VBox Example](layout/example1.simple.layout.py) in [pyTermTk](https://github.com/ceccopierangiolieugenio/pyTermTk)
+
+```python
+import TermTk as ttk
+
+    # TTkLayout is used by default
+root = ttk.TTk()
+
+    # Attach 4 buttons to the root widget
+ttk.TTkButton(parent=root, pos=(0,0),  size=(15,5), border=True, text="Button1")
+ttk.TTkButton(parent=root, pos=(0,5),  size=(10,4), border=True, text="Button2")
+ttk.TTkButton(parent=root, pos=(10,6), size=(10,3), border=True, text="Button3")
+ttk.TTkButton(parent=root, pos=(13,1), size=(15,3), border=True, text="Button4")
+
+root.mainloop()
+```
+
+The above code produces the following output
+```text
+┌─────────────┐
+│            ┌─────────────┐
+│   Button1  │   Button4   │
+│            ╘═════════════╛
+╘═════════════╛
+┌────────┐
+│Button2 │┌────────┐
+│        ││Button3 │
+╘════════╛╘════════╛
+
+```
+
+## Example 2 - Simple [TTkVBoxLayout](https://ceccopierangiolieugenio.github.io/pyTermTk/TTkLayouts/boxlayout.html#TermTk.TTkLayouts.boxlayout.TTkVBoxLayout)
+Following is the code to execute [VBox Example](layout/example2.simple.vbox.py) in [pyTermTk](https://github.com/ceccopierangiolieugenio/pyTermTk)
 
 ```python
-import sys, os
 import TermTk as ttk
 
     # Set the VBoxLayout as defaut in the terminal widget
@@ -112,11 +143,10 @@ The above code produces the following output
 ╘═══════════════════════════════════════════════════════════╛
 ```
 
-## Example 2 - Simple [TTkHBoxLayout](https://ceccopierangiolieugenio.github.io/pyTermTk/TTkLayouts/boxlayout.html#TermTk.TTkLayouts.boxlayout.TTkHBoxLayout)
-Following is the code to execute [HBox Example](layout/example2.simple.hbox.py) in [pyTermTk](https://github.com/ceccopierangiolieugenio/pyTermTk)
+## Example 3 - Simple [TTkHBoxLayout](https://ceccopierangiolieugenio.github.io/pyTermTk/TTkLayouts/boxlayout.html#TermTk.TTkLayouts.boxlayout.TTkHBoxLayout)
+Following is the code to execute [HBox Example](layout/example3.simple.hbox.py) in [pyTermTk](https://github.com/ceccopierangiolieugenio/pyTermTk)
 
 ```python
-import sys, os
 import TermTk as ttk
 
     # Set the HBoxLayout as defaut in the terminal widget
@@ -156,11 +186,10 @@ The above code produces the following output
 
 ```
 
-## Example 3 - Simple [TTkGridLayout](https://ceccopierangiolieugenio.github.io/pyTermTk/TTkLayouts/boxlayout.html#TermTk.TTkLayouts.gridlayout.TTkGridLayout)
-Following is the code to execute [HBox Example](layout/example3.simple.grid.py) in [pyTermTk](https://github.com/ceccopierangiolieugenio/pyTermTk)
+## Example 4 - Simple [TTkGridLayout](https://ceccopierangiolieugenio.github.io/pyTermTk/TTkLayouts/gridlayout.html#TermTk.TTkLayouts.gridlayout.TTkGridLayout)
+Following is the code to execute [HBox Example](layout/example4.simple.grid.py) in [pyTermTk](https://github.com/ceccopierangiolieugenio/pyTermTk)
 
 ```python
-import sys, os
 import TermTk as ttk
 
     # Set the GridLayout as defaut in the terminal widget
@@ -204,11 +233,10 @@ root.mainloop()
                                         ╘═════════════════╛
 ```
 
-## Example 4 - Nested Layouts
-Following is the code to execute [Nested Layouts Example](layout/example4.nested.layouts.py) in [pyTermTk](https://github.com/ceccopierangiolieugenio/pyTermTk)
+## Example 5 - Nested Layouts
+Following is the code to execute [Nested Layouts Example](layout/example5.nested.layouts.py) in [pyTermTk](https://github.com/ceccopierangiolieugenio/pyTermTk)
 
 ```python
-import sys, os
 import TermTk as ttk
 
     # Set the GridLayout as defaut in the terminal widget
diff --git a/tutorial/004-logging.md b/tutorial/004-logging.md
new file mode 100644
index 00000000..c401417e
--- /dev/null
+++ b/tutorial/004-logging.md
@@ -0,0 +1,111 @@
+# [pyTermTk](https://github.com/ceccopierangiolieugenio/pyTermTk) - Logging
+
+## Intro
+The [TTkLog](https://ceccopierangiolieugenio.github.io/pyTermTk/TTkCore/log.html) class provide a set of api to allow and configure the logging.
+
+
+## Example 1 - Log to file
+From [example1.logtofile.py](logging/example1.logtofile.py)
+
+```python
+import TermTk as ttk
+
+    # session.log is used by default
+ttk.TTkLog.use_default_file_logging()
+
+ttk.TTkLog.info(    "Test Info Messgae")
+ttk.TTkLog.debug(   "Test Debug Messgae")
+ttk.TTkLog.error(   "Test Error Messgae")
+ttk.TTkLog.warn(    "Test Warning Messgae")
+ttk.TTkLog.critical("Test Critical Messgae")
+ttk.TTkLog.fatal(   "Test Fatal Messgae")
+```
+
+## Example 2 - Log to stdout
+From [example2.logtostdout.py ](logging/example2.logtostdout.py )
+```python
+import TermTk as ttk
+
+ttk.TTkLog.use_default_stdout_logging()
+
+ttk.TTkLog.info(    "Test Info Messgae")
+ttk.TTkLog.debug(   "Test Debug Messgae")
+ttk.TTkLog.error(   "Test Error Messgae")
+ttk.TTkLog.warn(    "Test Warning Messgae")
+ttk.TTkLog.critical("Test Critical Messgae")
+ttk.TTkLog.fatal(   "Test Fatal Messgae")
+```
+
+## Example 3 - custom logging
+From [example3.customlogging.py ](logging/example3.customlogging.py )
+```python
+import TermTk as ttk
+
+    # define the callback used to process the log message
+def message_handler(mode, context, message):
+    msgType = "NONE"
+    if mode == ttk.TTkLog.InfoMsg:       msgType = "[INFO]"
+    elif mode == ttk.TTkLog.WarningMsg:  msgType = "[WARNING]"
+    elif mode == ttk.TTkLog.CriticalMsg: msgType = "[CRITICAL]"
+    elif mode == ttk.TTkLog.FatalMsg:    msgType = "[FATAL]"
+    elif mode == ttk.TTkLog.ErrorMsg:    msgType = "[ERROR]"
+    print(f"{msgType} {context.file} {message}")
+
+    # Register the callback to the message handler
+ttk.TTkLog.installMessageHandler(message_handler)
+
+ttk.TTkLog.info(    "Test Info Messgae")
+ttk.TTkLog.debug(   "Test Debug Messgae")
+ttk.TTkLog.error(   "Test Error Messgae")
+ttk.TTkLog.warn(    "Test Warning Messgae")
+ttk.TTkLog.critical("Test Critical Messgae")
+ttk.TTkLog.fatal(   "Test Fatal Messgae")
+```
+
+## Example 4 - Use [TTkLogViewer](https://ceccopierangiolieugenio.github.io/pyTermTk/TTkTestWidgets/logviewer.html) widget
+From [example4.ttklogviewer.py](logging/example4.ttklogviewer.py)
+```python
+import TermTk as ttk
+
+root = ttk.TTk()
+
+    # Create a window and attach it to the root (parent=root)
+logWin = ttk.TTkWindow(parent=root,pos = (1,1), size=(80,20), title="LogViewer Window", border=True, layout=ttk.TTkVBoxLayout())
+
+    # Define the Label and attach it to the window (parent=helloWin)
+ttk.TTkLogViewer(parent=logWin)
+
+ttk.TTkLog.info(    "Test Info Messgae")
+ttk.TTkLog.debug(   "Test Debug Messgae")
+ttk.TTkLog.error(   "Test Error Messgae")
+ttk.TTkLog.warn(    "Test Warning Messgae")
+ttk.TTkLog.critical("Test Critical Messgae")
+ttk.TTkLog.fatal(   "Test Fatal Messgae")
+
+    # Start the Main loop
+root.mainloop()
+```
+The above code produces the following output
+
+```text
+╔══════════════════════════════════════════════════════════════════════════════╗
+║ LogViewer Window                                                             ║
+╟──────────────────────────────────────────────────────────────────────────────╢
+║                                                                              ║
+║INFO : tutorial/logging/example4.ttklogviewer.py:36 Test Info Messgae         ║
+║DEBUG: tutorial/logging/example4.ttklogviewer.py:37 Test Debug Messgae        ║
+║ERROR: tutorial/logging/example4.ttklogviewer.py:38 Test Error Messgae        ║
+║WARNING : tutorial/logging/example4.ttklogviewer.py:39 Test Warning Messgae   ║
+║CRITICAL: tutorial/logging/example4.ttklogviewer.py:40 Test Critical Messgae  ║
+║FATAL: tutorial/logging/example4.ttklogviewer.py:41 Test Fatal Messgae        ║
+║DEBUG: _/.venv/lib/python3.8/site-packages/TermTk/TTkCore/ttk.py:70 Starting M║
+║DEBUG: _/.venv/lib/python3.8/site-packages/TermTk/TTkCore/ttk.py:80 Signal Eve║
+║DEBUG: _/.venv/lib/python3.8/site-packages/TermTk/TTkCore/ttk.py:65 fps: 33   ║
+║DEBUG: _/.venv/lib/python3.8/site-packages/TermTk/TTkCore/ttk.py:65 fps: 34   ║
+║DEBUG: _/.venv/lib/python3.8/site-packages/TermTk/TTkCore/ttk.py:65 fps: 34   ║
+║                                                                              ║
+║                                                                              ║
+║                                                                              ║
+║◀▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓┄┄┄┄┄┄┄┄┄┄┄▶║
+╚══════════════════════════════════════════════════════════════════════════════╝
+```
\ No newline at end of file
diff --git a/tutorial/helloworld/helloworld.001.py b/tutorial/helloworld/helloworld.001.py
index 7b67386a..035f01e3 100755
--- a/tutorial/helloworld/helloworld.001.py
+++ b/tutorial/helloworld/helloworld.001.py
@@ -22,7 +22,6 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-import sys, os
 import TermTk as ttk
 
 root = ttk.TTk()
diff --git a/tutorial/helloworld/helloworld.002.py b/tutorial/helloworld/helloworld.002.py
index 440b2380..8c2c8a33 100755
--- a/tutorial/helloworld/helloworld.002.py
+++ b/tutorial/helloworld/helloworld.002.py
@@ -22,7 +22,6 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-import sys, os
 import TermTk as ttk
 
     # Create a root object (it is a widget that represent the terminal)
diff --git a/tutorial/layout/example1.simple.layout.py b/tutorial/layout/example1.simple.layout.py
new file mode 100755
index 00000000..8e91164c
--- /dev/null
+++ b/tutorial/layout/example1.simple.layout.py
@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+
+# MIT License
+#
+# Copyright (c) 2021 Eugenio Parodi <ceccopierangiolieugenio AT googlemail DOT com>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import TermTk as ttk
+
+    # TTkLayout is used by default
+root = ttk.TTk()
+
+    # Attach 4 buttons to the root widget
+ttk.TTkButton(parent=root, pos=(0,0),  size=(15,5), border=True, text="Button1")
+ttk.TTkButton(parent=root, pos=(0,5),  size=(10,4), border=True, text="Button2")
+ttk.TTkButton(parent=root, pos=(10,6), size=(10,3), border=True, text="Button3")
+ttk.TTkButton(parent=root, pos=(13,1), size=(15,3), border=True, text="Button4")
+
+root.mainloop()
\ No newline at end of file
diff --git a/tutorial/layout/example1.simple.vbox.py b/tutorial/layout/example2.simple.vbox.py
similarity index 99%
rename from tutorial/layout/example1.simple.vbox.py
rename to tutorial/layout/example2.simple.vbox.py
index 59c20343..c7e00b95 100755
--- a/tutorial/layout/example1.simple.vbox.py
+++ b/tutorial/layout/example2.simple.vbox.py
@@ -22,7 +22,6 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-import sys, os
 import TermTk as ttk
 
     # Set the VBoxLayout as defaut in the terminal widget
diff --git a/tutorial/layout/example2.simple.hbox.py b/tutorial/layout/example3.simple.hbox.py
similarity index 99%
rename from tutorial/layout/example2.simple.hbox.py
rename to tutorial/layout/example3.simple.hbox.py
index b33ac19a..705d2d0a 100755
--- a/tutorial/layout/example2.simple.hbox.py
+++ b/tutorial/layout/example3.simple.hbox.py
@@ -22,7 +22,6 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-import sys, os
 import TermTk as ttk
 
     # Set the HBoxLayout as defaut in the terminal widget
diff --git a/tutorial/layout/example3.simple.grid.py b/tutorial/layout/example4.simple.grid.py
similarity index 96%
rename from tutorial/layout/example3.simple.grid.py
rename to tutorial/layout/example4.simple.grid.py
index 11965913..58a67863 100755
--- a/tutorial/layout/example3.simple.grid.py
+++ b/tutorial/layout/example4.simple.grid.py
@@ -22,7 +22,6 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-import sys, os
 import TermTk as ttk
 
     # Set the GridLayout as defaut in the terminal widget
@@ -30,7 +29,7 @@ gridLayout = ttk.TTkGridLayout(columnMinHeight=0,columnMinWidth=2)
 root = ttk.TTk(layout=gridLayout)
 
     # Attach 2 buttons to the root widget using the default method
-    # this wil append them to the first row
+    # this will append them to the first row
 ttk.TTkButton(parent=root, border=True, text="Button1")
 ttk.TTkButton(parent=root, border=True, text="Button2")
     # Attach 2 buttons to a specific position in the grid
diff --git a/tutorial/layout/example4.nested.layouts.py b/tutorial/layout/example5.nested.layouts.py
similarity index 99%
rename from tutorial/layout/example4.nested.layouts.py
rename to tutorial/layout/example5.nested.layouts.py
index 0cdff20a..a7f5d555 100755
--- a/tutorial/layout/example4.nested.layouts.py
+++ b/tutorial/layout/example5.nested.layouts.py
@@ -22,7 +22,6 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-import sys, os
 import TermTk as ttk
 
     # Set the GridLayout as defaut in the terminal widget
diff --git a/tutorial/logging/example1.logtofile.py b/tutorial/logging/example1.logtofile.py
new file mode 100755
index 00000000..ace9e9df
--- /dev/null
+++ b/tutorial/logging/example1.logtofile.py
@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+
+# MIT License
+#
+# Copyright (c) 2021 Eugenio Parodi <ceccopierangiolieugenio AT googlemail DOT com>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import TermTk as ttk
+
+    # session.log is used by default
+ttk.TTkLog.use_default_file_logging()
+
+ttk.TTkLog.info(    "Test Info Messgae")
+ttk.TTkLog.debug(   "Test Debug Messgae")
+ttk.TTkLog.error(   "Test Error Messgae")
+ttk.TTkLog.warn(    "Test Warning Messgae")
+ttk.TTkLog.critical("Test Critical Messgae")
+ttk.TTkLog.fatal(   "Test Fatal Messgae")
+
diff --git a/tutorial/logging/example2.logtostdout.py b/tutorial/logging/example2.logtostdout.py
new file mode 100755
index 00000000..c9da164d
--- /dev/null
+++ b/tutorial/logging/example2.logtostdout.py
@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+
+# MIT License
+#
+# Copyright (c) 2021 Eugenio Parodi <ceccopierangiolieugenio AT googlemail DOT com>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import TermTk as ttk
+
+ttk.TTkLog.use_default_stdout_logging()
+
+ttk.TTkLog.info(    "Test Info Messgae")
+ttk.TTkLog.debug(   "Test Debug Messgae")
+ttk.TTkLog.error(   "Test Error Messgae")
+ttk.TTkLog.warn(    "Test Warning Messgae")
+ttk.TTkLog.critical("Test Critical Messgae")
+ttk.TTkLog.fatal(   "Test Fatal Messgae")
diff --git a/tutorial/logging/example3.customlogging.py b/tutorial/logging/example3.customlogging.py
new file mode 100755
index 00000000..4d434e3d
--- /dev/null
+++ b/tutorial/logging/example3.customlogging.py
@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+
+# MIT License
+#
+# Copyright (c) 2021 Eugenio Parodi <ceccopierangiolieugenio AT googlemail DOT com>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import TermTk as ttk
+
+    # define the callback used to process the log message
+def message_handler(mode, context, message):
+    msgType = "NONE"
+    if mode == ttk.TTkLog.InfoMsg:       msgType = "[INFO]"
+    elif mode == ttk.TTkLog.WarningMsg:  msgType = "[WARNING]"
+    elif mode == ttk.TTkLog.CriticalMsg: msgType = "[CRITICAL]"
+    elif mode == ttk.TTkLog.FatalMsg:    msgType = "[FATAL]"
+    elif mode == ttk.TTkLog.ErrorMsg:    msgType = "[ERROR]"
+    print(f"{msgType} {context.file} {message}")
+
+    # Register the callback to the message handler
+ttk.TTkLog.installMessageHandler(message_handler)
+
+ttk.TTkLog.info(    "Test Info Messgae")
+ttk.TTkLog.debug(   "Test Debug Messgae")
+ttk.TTkLog.error(   "Test Error Messgae")
+ttk.TTkLog.warn(    "Test Warning Messgae")
+ttk.TTkLog.critical("Test Critical Messgae")
+ttk.TTkLog.fatal(   "Test Fatal Messgae")
diff --git a/tutorial/logging/example4.ttklogviewer.py b/tutorial/logging/example4.ttklogviewer.py
new file mode 100755
index 00000000..80713fdb
--- /dev/null
+++ b/tutorial/logging/example4.ttklogviewer.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+
+# MIT License
+#
+# Copyright (c) 2021 Eugenio Parodi <ceccopierangiolieugenio AT googlemail DOT com>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import TermTk as ttk
+
+root = ttk.TTk()
+
+    # Create a window and attach it to the root (parent=root)
+logWin = ttk.TTkWindow(parent=root,pos = (1,1), size=(80,20), title="LogViewer Window", border=True, layout=ttk.TTkVBoxLayout())
+
+    # Define the Label and attach it to the window (parent=helloWin)
+ttk.TTkLogViewer(parent=logWin)
+
+ttk.TTkLog.info(    "Test Info Messgae")
+ttk.TTkLog.debug(   "Test Debug Messgae")
+ttk.TTkLog.error(   "Test Error Messgae")
+ttk.TTkLog.warn(    "Test Warning Messgae")
+ttk.TTkLog.critical("Test Critical Messgae")
+ttk.TTkLog.fatal(   "Test Fatal Messgae")
+
+    # Start the Main loop
+root.mainloop()
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