Changed ReadNonBlocking to Finalize for forms needing to do an Update prior to Read

Demo_Button_Click.py

@@ -0,0 +1,27 @@
+import PySimpleGUI as sg
+import winsound
+
+
+sg.ChangeLookAndFeel('Dark')
+sg.SetOptions(element_padding=(0,0))
+
+layout = [
+          [sg.ReadFormButton('Start', button_color=('white', 'black'), key='start'),
+           sg.ReadFormButton('Stop', button_color=('white', 'black'), key='stop'),
+           sg.ReadFormButton('Reset', button_color=('white', 'firebrick3'), key='reset'),
+           sg.ReadFormButton('Submit', button_color=('white', 'springgreen4'), key='submit')]
+          ]
+
+form = sg.FlexForm("Button Click", default_element_size=(12,1), text_justification='r', auto_size_text=False, auto_size_buttons=False,
+                   default_button_element_size=(12,1))
+form.Layout(layout)
+form.Finalize()
+
+form.FindElement('submit').Update(disabled=True)
+
+recording = have_data = False
+while True:
+    button, values = form.Read()
+    if button is None:
+        exit(69)
+    winsound.PlaySound("ButtonClick.wav", 1)