Demo updates with new theme calls

DemoPrograms/Demo_Script_Parameters.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 import PySimpleGUI as sg
-
+import sys
 '''
 Quickly add a GUI to your script!
 
@@ -13,6 +13,7 @@ The 1-line-GUI shows a form that allows the user to browse to find the filename.
 stores the result in the variable fname, just like the command line parsing did.
 '''
 
+fname = ''
 if len(sys.argv) == 1:
     layout = [
         [sg.Text('Document to open')],
@@ -22,6 +23,7 @@ if len(sys.argv) == 1:
     window = sg.Window('My Script', layout)
     event, values = window.read()
     window.close()
+    fname = values['-FNAME-']
 else:
     fname = sys.argv[1]
 if not fname: