diff --git a/DemoPrograms/Demo_System_Tray_GUI_Window_Design_Pattern.py b/DemoPrograms/Demo_System_Tray_GUI_Window_Design_Pattern.py
new file mode 100644
index 00000000..7fcefa1a
--- /dev/null
+++ b/DemoPrograms/Demo_System_Tray_GUI_Window_Design_Pattern.py
@@ -0,0 +1,85 @@
+import PySimpleGUI as sg
+# import PySimpleGUIWx as sg
+# import PySimpleGUIQt as sg
+import time
+
+"""
+    Design pattern - System Tray and GUI Window
+    
+    This design pattern will show you how to run a system tray icon and a GUI window
+    simultaneously.  BOTH the system tray and the window will be active at the same time.
+    
+    The "close window" action is similar to what most windows programs do that have a tray icon.
+    When you close the window with an "X", it closes the GUI window and shows a message in the
+    tray that the window has been "Minimized".
+    
+    To make things "easier", a new window is created each time rather than trying to hide and unhide.
+    On some systems, the hide method doesn't work very well (Raspberry Pi for example).
+    
+    You can "Minimize" to the tray in 3 ways in this program:
+        1. Click the "X" on the window
+        2. Click the button "Minimize to tray"
+        3. Right click tray icon and choose "Hide"
+        
+    To exit the entire program, you will need to do this from the System tray by choosing "Exit"
+    
+    Copyright 2020 PySimpleGUI.org
+"""
+
+icon = sg.DEFAULT_BASE64_ICON
+
+sg.theme('Dark Red')
+delay_time = 15 * 60
+
+def time_as_int():
+    return int(round(time.time()))
+
+def make_a_window():
+
+    layout = [  [sg.Text(f'{delay_time // 60 % 60:2}:{delay_time % 60:02}', key='-OUT-', size=(20, 2), justification='c', font='Any 24')],
+                [sg.Button('Start', size=(10,1))],[sg.Button('Minimize\nTo Tray', size=(10,2))]  ]
+
+    return sg.Window('Window Title', layout, element_justification='c', icon=icon)
+
+def main():
+
+    menu_def = ['UNUSED', ['Show','Hide','Exit']]
+
+    tray = sg.SystemTray(menu=menu_def, data_base64=icon)
+    window = make_a_window()
+    start, current, paused = time_as_int(), 0, True
+
+    while True:
+        event = tray.read(timeout=100)
+        if event == 'Exit':
+            break
+        elif event in('Show', sg.EVENT_SYSTEM_TRAY_ICON_DOUBLE_CLICKED) and not window:
+            print('Showing a new window')
+            window, paused = make_a_window(), True
+        elif event == 'Hide' and window:
+            window.close()
+            window = None
+
+        if window:
+            event, values = window.read(timeout=1000)
+            if event in (sg.WIN_CLOSED, 'Minimize\nTo Tray'):
+                print('Minimizing to tray')
+                tray.show_message('Minimizing', 'Minimizing to Tray')
+                window.close()
+                window = None
+                continue
+            elif event == 'Start':
+                start, paused = time_as_int(), False
+            if not paused:
+                remaining = delay_time - (time_as_int() - start)
+                if remaining < 0:
+                    tray.show_message('Look away', 'It is time to look away for 20 seconds')
+                    start = time_as_int()
+                else:
+                    window['-OUT-'].update(f'{remaining//60%60:2}:{remaining%60:02}')
+    tray.close()
+    if window:
+        window.close()
+
+
+main()
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