diff --git a/Demo_Script_Parameters.py b/Demo_Script_Parameters.py
new file mode 100644
index 00000000..aa16c065
--- /dev/null
+++ b/Demo_Script_Parameters.py
@@ -0,0 +1,25 @@
+import PySimpleGUI as sg
+import sys
+
+'''
+Quickly add a GUI to your script!
+
+This simple script shows a 1-line-GUI addition to a typical Python command line script.
+
+Previously this script accepted 1 parameter on the command line.  When executed, that
+parameter is read into the variable fname.
+
+The 1-line-GUI shows a form that allows the user to browse to find the filename. The GUI
+stores the result in the variable fname, just like the command line parsing did.
+'''
+
+if len(sys.argv) == 1:
+    button, (fname,) = sg.FlexForm('My Script').LayoutAndRead([[sg.T('Document to open')],
+                                                           [sg.In(), sg.FileBrowse()],
+                                                           [sg.Open(), sg.Cancel()]])
+else:
+    fname = sys.argv[1]
+
+if not fname:
+    sg.MsgBox("Cancel", "No filename supplied")
+    raise SystemExit("Cancelling: no filename supplied")
diff --git a/PySimpleGUI.py b/PySimpleGUI.py
index 851ff285..4438b7db 100644
--- a/PySimpleGUI.py
+++ b/PySimpleGUI.py
@@ -1116,7 +1116,6 @@ class FlexForm:
         else:
             return self.ReturnValues
 
-
     def ReadNonBlocking(self, Message=''):
         if self.TKrootDestroyed:
             return None, None
@@ -1132,6 +1131,15 @@ class FlexForm:
             # return None, None
         return BuildResults(self, False, self)
 
+    def Refresh(self):
+        if self.TKrootDestroyed:
+            return
+        try:
+            rc = self.TKroot.update()
+        except:
+            pass
+
+
     def GetScreenDimensions(self):
         if self.TKrootDestroyed:
             return None, None
@@ -1302,6 +1310,10 @@ def Save(button_text='Save', scale=(None, None), size=(None, None), auto_size_bu
 def Submit(button_text='Submit', scale=(None, None), size=(None, None), auto_size_button=None, button_color=None, bind_return_key=True,font=None, focus=False, pad=None):
     return Button(BUTTON_TYPE_CLOSES_WIN, button_text=button_text, scale=scale, size=size, auto_size_button=auto_size_button, button_color=button_color,font=font, bind_return_key=bind_return_key, focus=focus, pad=pad)
 
+# -------------------------  OPEN BUTTON Element lazy function  ------------------------- #
+def Open(button_text='Open', scale=(None, None), size=(None, None), auto_size_button=None, button_color=None, bind_return_key=True,font=None, focus=False, pad=None):
+    return Button(BUTTON_TYPE_CLOSES_WIN, button_text=button_text, scale=scale, size=size, auto_size_button=auto_size_button, button_color=button_color,font=font, bind_return_key=bind_return_key, focus=focus, pad=pad)
+
 # -------------------------  OK BUTTON Element lazy function  ------------------------- #
 def OK(button_text='OK', scale=(None, None), size=(None, None), auto_size_button=None, button_color=None, bind_return_key=True, font=None,focus=False, pad=None):
     return Button(BUTTON_TYPE_CLOSES_WIN, button_text=button_text, scale=scale, size=size, auto_size_button=auto_size_button, button_color=button_color,font=font, bind_return_key=bind_return_key, focus=focus, pad=pad)
@@ -1336,7 +1348,7 @@ def SimpleButton(button_text, image_filename=None, image_size=(None, None), imag
     return Button(BUTTON_TYPE_CLOSES_WIN, image_filename=image_filename, image_size=image_size, image_subsample=image_subsample, button_text=button_text, border_width=border_width, scale=scale, size=size, auto_size_button=auto_size_button, button_color=button_color, font=font, bind_return_key=bind_return_key, focus=focus, pad=pad)
 # -------------------------  GENERIC BUTTON Element lazy function  ------------------------- #
 # this is the only button that REQUIRES button text field
-def ReadFormButton(button_text, image_filename=None, image_size=(None, None),image_subsample=None,border_width=None,scale=(None, None), size=(None, None), auto_size_button=None, button_color=None, font=None, bind_return_key=False, bind_listbox_select=False, focus=False, pad=None):
+def ReadFormButton(button_text, image_filename=None, image_size=(None, None),image_subsample=None,border_width=None,scale=(None, None), size=(None, None), auto_size_button=None, button_color=None, font=None, bind_return_key=False, focus=False, pad=None):
     return Button(BUTTON_TYPE_READ_FORM, image_filename=image_filename, image_size=image_size, image_subsample=image_subsample, border_width=border_width, button_text=button_text, scale=scale, size=size, auto_size_button=auto_size_button, button_color=button_color, font=font, bind_return_key=bind_return_key, focus=focus, pad=pad)
 
 def RealtimeButton(button_text, image_filename=None, image_size=(None, None),image_subsample=None,border_width=None,scale=(None, None), size=(None, None), auto_size_button=None, button_color=None, font=None, bind_return_key=False, focus=False, pad=None):
diff --git a/docs/cookbook.md b/docs/cookbook.md
index 871ca197..44453e27 100644
--- a/docs/cookbook.md
+++ b/docs/cookbook.md
@@ -66,6 +66,31 @@ Browse for a filename that is populated into the input field.
     print(button, source_filename)
 
 --------------------------
+## Add GUI to Front-End of Script
+Quickly add a GUI allowing the user to browse for a filename if a filename is not supplied on the command line using this 1-line GUI. It's the best of both worlds.
+
+![script front-end](https://user-images.githubusercontent.com/13696193/44756573-39e9c380-aaf9-11e8-97b4-6679f9f5bd46.jpg)
+
+
+    import PySimpleGUI as sg
+    import sys
+
+    if len(sys.argv) == 1:
+        button, (fname,) = sg.FlexForm('My Script').LayoutAndRead([[sg.T('Document to open')],
+                                                               [sg.In(), sg.FileBrowse()],
+                                                               [sg.Open(), sg.Cancel()]])
+    else:
+        fname = sys.argv[1]
+
+    if not fname:
+        sg.MsgBox("Cancel", "No filename supplied")
+        raise SystemExit("Cancelling: no filename supplied")
+
+
+
+
+--------------
+
 ## Compare 2 Files
 
 Browse to get 2 file names that can be then compared.  Uses a context manager