New statusbar demo to accompany change to StatusBar element.

DemoPrograms/Demo_Status_Bar.py

@@ -0,0 +1,40 @@
+import PySimpleGUI as sg
+
+"""
+    Demo Status Bar
+    
+    This demo shows you how to create your statusbar in a way that will keep it at the bottom of
+    a resizeable window.  The key is the correct setting of the Expand settings for both the 
+    StatusBar (done for you) and for a line above it that will keep it pushed to the bottom of the window.
+    It's possible to also "simulate" a statusbar (i.e. use a text element or something else) by also
+    configuring that element with the correct expand setting (X direction = True, expand row=True)
+    
+    Copyright 2020 PySimpleGUI.org
+"""
+
+def main():
+
+    layout = [  [sg.Text('StatusBar Demo', font='ANY 15')],
+                [sg.Text('This window has a status bar that is at the bottom of the window')],
+                [sg.Text('The key to getting your bar to stay at the bottom of the window when')],
+                [sg.Text('the window is resizeed is to insert a line of text (or some other element)')],
+                [sg.Text('that is configured to expand.  ')],
+                [sg.Text('This is accomplished by calling the "expand" method')],
+                [sg.Text('')],
+                [sg.Button('Ok'), sg.B('Quit')],
+                [sg.Text(key='-EXPAND-', font='ANY 1', pad=(0,0))],  # thin row (font size 1) that expands and keeps bar at the bottom
+                [sg.StatusBar('This is the statusbar')]]
+
+
+    window = sg.Window('Vertical Layout Example', layout, resizable=True, finalize=True)
+
+    window['-EXPAND-'].expand(True, True, True)     # needed to make the window expand in a way that will cause status to be at the bottom
+
+    while True:
+        event, values = window.read()
+        if event in (sg.WINDOW_CLOSED, 'Quit'):   # if user closes window or clicks Quit
+            break
+
+if __name__ == '__main__':
+    main()
+