Refresh of ALL Demos in prep for 2.20 release

Demo_ElementBrowser.py

@@ -0,0 +1,24 @@
+import PySimpleGUI as sg
+
+def ShowMainForm():
+
+    listbox_values = ('Text', 'InputText', 'Checkbox', 'Radio Button', 'Listbox', 'Slider' )
+
+    column2 = [ [sg.Output(size=(50, 20))],
+                [sg.ReadFormButton('Show Element'), sg.SimpleButton('Exit')]]
+
+    column1 = [[sg.Listbox(values=listbox_values, size=(20, len(listbox_values)), key='listbox')],
+               [sg.Text('', size=(10, 15))]]
+
+    layout = [[sg.Column(column1) , sg.Column(column2)]]
+
+    form = sg.FlexForm('Element Browser')
+    form.Layout(layout)
+    while True:
+        button, values = form.Read()
+        if button is None or button == 'Exit':
+            break
+        sg.MsgBox(button, values['listbox'][0])
+
+
+ShowMainForm()