Fixed import as g instead of sg bug, made some demos borderless, used form.FindElement where possible, fixed PopupGetFile and PopupGetFolder no_window option

Demo_NonBlocking_Form.py

@@ -8,10 +8,9 @@ def StatusOutputExample():
     # Make a form, but don't use context manager
     form = sg.FlexForm('Running Timer', auto_size_text=True)
     # Create a text element that will be updated with status information on the GUI itself
-    output_element = sg.Text('', size=(8, 2), font=('Helvetica', 20), justification='center')
     # Create the rows
     form_rows = [[sg.Text('Non-blocking GUI with updates')],
-                 [output_element],
+                 [sg.Text('', size=(8, 2), font=('Helvetica', 20), justification='center', key='output')],
                  [sg.ReadFormButton('LED On'), sg.ReadFormButton('LED Off'), sg.ReadFormButton('Quit')]]
     # Layout the rows of the form and perform a read. Indicate the form is non-blocking!
     form.LayoutAndRead(form_rows, non_blocking=True)
@@ -25,7 +24,7 @@ def StatusOutputExample():
     i=0
     while (True):
         # This is the code that reads and updates your window
-        output_element.Update('{:02d}:{:02d}.{:02d}'.format((i // 100) // 60, (i // 100) % 60, i % 100))
+        form.FindElement('output').Update('{:02d}:{:02d}.{:02d}'.format((i // 100) // 60, (i // 100) % 60, i % 100))
         button, values = form.ReadNonBlocking()
         if button == 'Quit' or values is None:
             break