diff --git a/DemoPrograms/Demo_Design_Pattern_Multiple_Windows3.py b/DemoPrograms/Demo_Design_Pattern_Multiple_Windows3.py
index b92ff1a6..848d20f1 100644
--- a/DemoPrograms/Demo_Design_Pattern_Multiple_Windows3.py
+++ b/DemoPrograms/Demo_Design_Pattern_Multiple_Windows3.py
@@ -1,45 +1,48 @@
 import PySimpleGUI as sg
 
-layout = [[ sg.Text('Window 1'),],
-         [sg.Input(do_not_clear=True)],
-         [sg.Text('', key='_OUTPUT_')],
-         [sg.Button('Next >'), sg.Button('Exit')]]
+layout = [[sg.Text('Window 1'), ],
+          [sg.Input(do_not_clear=True)],
+          [sg.Text('', key='_OUTPUT_')],
+          [sg.Button('Next >'), sg.Button('Exit')]]
 
 win1 = sg.Window('Window 1').Layout(layout)
 
 win3_active = win2_active = False
 while True:
-   ev1, vals1 = win1.Read(timeout=100)
-   if ev1 is None or ev1 == 'Exit':
-       break
-   win1.FindElement('_OUTPUT_').Update(vals1[0])
+    if not win2_active:
+        ev1, vals1 = win1.Read()
+        if ev1 is None or ev1 == 'Exit':
+            break
+        win1.FindElement('_OUTPUT_').Update(vals1[0])
 
-   if not win2_active and ev1 == 'Next >':
-       win2_active = True
-       win1.Hide()
-       layout2 = [[sg.Text('Window 2')],
-                  [sg.Button('< Prev'), sg.Button('Next >')]]
+    if not win2_active and ev1 == 'Next >':
+        win2_active = True
+        win1.Hide()
+        layout2 = [[sg.Text('Window 2')],
+                   [sg.Button('< Prev'), sg.Button('Next >')]]
 
-       win2 = sg.Window('Window 2').Layout(layout2)
+        win2 = sg.Window('Window 2').Layout(layout2)
 
-   if win2_active:
-       ev2, vals2 = win2.Read()
-       if ev2 in (None, 'Exit', '< Prev'):
-           win2_active  = False
-           win2.Close()
-           win1.UnHide()
-       elif ev2 == 'Next >':
-           win3_active = True
-           win2_active = False
-           win2.Hide()
-           layout3 = [[sg.Text('Window 3')],
-                      [sg.Button('< Prev'), sg.Button('Exit')]]
-           win3 = sg.Window('Window 3').Layout(layout3)
+    if win2_active:
+        ev2, vals2 = win2.Read()
+        if ev2 in (None, 'Exit', '< Prev'):
+            win2_active = False
+            win2.Close()
+            win1.UnHide()
+        elif ev2 == 'Next >':
+            win3_active = True
+            win2_active = False
+            win2.Hide()
+            layout3 = [[sg.Text('Window 3')],
+                       [sg.Button('< Prev'), sg.Button('Exit')]]
+            win3 = sg.Window('Window 3').Layout(layout3)
 
-   if win3_active:
-       ev3, vals3 = win3.Read()
-       if ev3 in (None, 'Exit', '< Prev'):
-           win3.Close()
-           win3_active  = False
-           win2_active  = True
-           win2.UnHide()
\ No newline at end of file
+    if win3_active:
+        ev3, vals3 = win3.Read()
+        if ev3 == '< Prev':
+            win3.Close()
+            win3_active = False
+            win2_active = True
+            win2.UnHide()
+        elif ev3 in (None, 'Exit'):
+            break