diff --git a/tkscrolledframe b/tkscrolledframe
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+++ b/tkscrolledframe
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+# Credit: https://github.com/bmjcode/tkScrolledFrame
+"""Implementation of the scrollable frame widget."""
+
+import sys
+
+try:
+    # Python 3
+    import tkinter as tk
+except (ImportError):
+    # Python 2
+    import Tkinter as tk
+
+try:
+    try:
+        # Python 3
+        import tkinter.ttk as ttk
+    except (ImportError):
+        # Python 2
+        import ttk
+except (ImportError):
+    # Can't provide ttk's Scrollbar
+    pass
+
+
+__all__ = ["ScrolledFrame"]
+
+
+class ScrolledFrame(tk.Frame):
+    """Scrollable Frame widget.
+
+    Use display_widget() to set the interior widget. For example,
+    to display a Label with the text "Hello, world!", you can say:
+
+        sf = ScrolledFrame(self)
+        sf.pack()
+        sf.display_widget(Label, text="Hello, world!")
+
+    The constructor accepts the usual Tkinter keyword arguments, plus
+    a handful of its own:
+
+      scrollbars (str; default: "both")
+        Which scrollbars to provide.
+        Must be one of "vertical", "horizontal," "both", or "neither".
+
+      use_ttk (bool; default: False)
+        Whether to use ttk widgets if available.
+        The default is to use standard Tk widgets. This setting has
+        no effect if ttk is not available on your system.
+    """
+
+    def __init__(self, master=None, **kw):
+        """Return a new scrollable frame widget."""
+
+        tk.Frame.__init__(self, master)
+
+        # Hold these names for the interior widget
+        self._interior = None
+        self._interior_id = None
+
+        # Whether to fit the interior widget's width to the canvas
+        self._fit_width = False
+
+        # Which scrollbars to provide
+        if "scrollbars" in kw:
+            scrollbars = kw["scrollbars"]
+            del kw["scrollbars"]
+
+            if not scrollbars:
+                scrollbars = self._DEFAULT_SCROLLBARS
+            elif not scrollbars in self._VALID_SCROLLBARS:
+                raise ValueError("scrollbars parameter must be one of "
+                                 "'vertical', 'horizontal', 'both', or "
+                                 "'neither'")
+        else:
+            scrollbars = self._DEFAULT_SCROLLBARS
+
+        # Whether to use ttk widgets if available
+        if "use_ttk" in kw:
+            if ttk and kw["use_ttk"]:
+                Scrollbar = ttk.Scrollbar
+            else:
+                Scrollbar = tk.Scrollbar
+            del kw["use_ttk"]
+        else:
+            Scrollbar = tk.Scrollbar
+
+        # Default to a 1px sunken border
+        if not "borderwidth" in kw:
+            kw["borderwidth"] = 1
+        if not "relief" in kw:
+            kw["relief"] = "sunken"
+
+        # Set up the grid
+        self.grid_columnconfigure(0, weight=1)
+        self.grid_rowconfigure(0, weight=1)
+
+        # Canvas to hold the interior widget
+        c = self._canvas = tk.Canvas(self,
+                                     borderwidth=0,
+                                     highlightthickness=0,
+                                     takefocus=0)
+
+        # Enable scrolling when the canvas has the focus
+        self.bind_arrow_keys(c)
+        self.bind_scroll_wheel(c)
+
+        # Call _resize_interior() when the canvas widget is updated
+        c.bind("<Configure>", self._resize_interior)
+
+        # Scrollbars
+        xs = self._x_scrollbar = Scrollbar(self,
+                                           orient="horizontal",
+                                           command=c.xview)
+        ys = self._y_scrollbar = Scrollbar(self,
+                                           orient="vertical",
+                                           command=c.yview)
+        c.configure(xscrollcommand=xs.set, yscrollcommand=ys.set)
+
+        # Lay out our widgets
+        c.grid(row=0, column=0, sticky="nsew")
+        if scrollbars == "vertical" or scrollbars == "both":
+            ys.grid(row=0, column=1, sticky="ns")
+        if scrollbars == "horizontal" or scrollbars == "both":
+            xs.grid(row=1, column=0, sticky="we")
+
+        # Forward these to the canvas widget
+        self.bind = c.bind
+        self.focus_set = c.focus_set
+        self.unbind = c.unbind
+        self.xview = c.xview
+        self.xview_moveto = c.xview_moveto
+        self.yview = c.yview
+        self.yview_moveto = c.yview_moveto
+
+        # Process our remaining configuration options
+        self.configure(**kw)
+
+    def __setitem__(self, key, value):
+        """Configure resources of a widget."""
+
+        if key in self._CANVAS_KEYS:
+            # Forward these to the canvas widget
+            self._canvas.configure(**{key: value})
+
+        else:
+            # Handle everything else normally
+            tk.Frame.configure(self, **{key: value})
+
+    # ------------------------------------------------------------------------
+
+    def bind_arrow_keys(self, widget):
+        """Bind the specified widget's arrow key events to the canvas."""
+
+        widget.bind("<Up>",
+                    lambda event: self._canvas.yview_scroll(-1, "units"))
+
+        widget.bind("<Down>",
+                    lambda event: self._canvas.yview_scroll(1, "units"))
+
+        widget.bind("<Left>",
+                    lambda event: self._canvas.xview_scroll(-1, "units"))
+
+        widget.bind("<Right>",
+                    lambda event: self._canvas.xview_scroll(1, "units"))
+
+    def bind_scroll_wheel(self, widget):
+        """Bind the specified widget's mouse scroll event to the canvas."""
+
+        widget.bind("<MouseWheel>", self._scroll_canvas)
+        widget.bind("<Button-4>", self._scroll_canvas)
+        widget.bind("<Button-5>", self._scroll_canvas)
+
+    def cget(self, key):
+        """Return the resource value for a KEY given as string."""
+
+        if key in self._CANVAS_KEYS:
+            return self._canvas.cget(key)
+
+        else:
+            return tk.Frame.cget(self, key)
+
+    # Also override this alias for cget()
+    __getitem__ = cget
+
+    def configure(self, cnf=None, **kw):
+        """Configure resources of a widget."""
+
+        # This is overridden so we can use our custom __setitem__()
+        # to pass certain options directly to the canvas.
+        if cnf:
+            for key in cnf:
+                self[key] = cnf[key]
+
+        for key in kw:
+            self[key] = kw[key]
+
+    # Also override this alias for configure()
+    config = configure
+
+    def display_widget(self, widget_class, fit_width=False, **kw):
+        """Create and display a new widget.
+
+        If fit_width == True, the interior widget will be stretched as
+        needed to fit the width of the frame.
+
+        Keyword arguments are passed to the widget_class constructor.
+
+        Returns the new widget.
+        """
+
+        # Blank the canvas
+        self.erase()
+
+        # Set width fitting
+        self._fit_width = fit_width
+
+        # Set the new interior widget
+        self._interior = widget_class(self._canvas, **kw)
+
+        # Add the interior widget to the canvas, and save its widget ID
+        # for use in _resize_interior()
+        self._interior_id = self._canvas.create_window(0, 0,
+                                                       anchor="nw",
+                                                       window=self._interior)
+
+        # Call _update_scroll_region() when the interior widget is resized
+        self._interior.bind("<Configure>", self._update_scroll_region)
+
+        # Fit the interior widget to the canvas if requested
+        # We don't need to check fit_width here since _resize_interior()
+        # already does.
+        self._resize_interior()
+
+        # Scroll to the top-left corner of the canvas
+        self.scroll_to_top()
+
+        return self._interior
+
+    def erase(self):
+        """Erase the displayed widget."""
+
+        # Clear the canvas
+        self._canvas.delete("all")
+
+        # Delete the interior widget
+        del self._interior
+        del self._interior_id
+
+        # Save these names
+        self._interior = None
+        self._interior_id = None
+
+        # Reset width fitting
+        self._fit_width = False
+
+    def scroll_to_top(self):
+        """Scroll to the top-left corner of the canvas."""
+
+        self._canvas.xview_moveto(0)
+        self._canvas.yview_moveto(0)
+
+    # ------------------------------------------------------------------------
+
+    def _resize_interior(self, event=None):
+        """Resize the interior widget to fit the canvas."""
+
+        if self._fit_width and self._interior_id:
+            # The current width of the canvas
+            canvas_width = self._canvas.winfo_width()
+
+            # The interior widget's requested width
+            requested_width = self._interior.winfo_reqwidth()
+
+            if requested_width != canvas_width:
+                # Resize the interior widget
+                new_width = max(canvas_width, requested_width)
+                self._canvas.itemconfigure(self._interior_id, width=new_width)
+
+    def _scroll_canvas(self, event):
+        """Scroll the canvas."""
+
+        c = self._canvas
+
+        if sys.platform.startswith("darwin"):
+            # macOS
+            c.yview_scroll(-1 * event.delta, "units")
+
+        elif event.num == 4:
+            # Unix - scroll up
+            c.yview_scroll(-1, "units")
+
+        elif event.num == 5:
+            # Unix - scroll down
+            c.yview_scroll(1, "units")
+
+        else:
+            # Windows
+            c.yview_scroll(-1 * (event.delta // 120), "units")
+
+    def _update_scroll_region(self, event):
+        """Update the scroll region when the interior widget is resized."""
+
+        # The interior widget's requested width and height
+        req_width = self._interior.winfo_reqwidth()
+        req_height = self._interior.winfo_reqheight()
+
+        # Set the scroll region to fit the interior widget
+        self._canvas.configure(scrollregion=(0, 0, req_width, req_height))
+
+    # ------------------------------------------------------------------------
+
+    # Keys for configure() to forward to the canvas widget
+    _CANVAS_KEYS = "width", "height", "takefocus"
+
+    # Scrollbar-related configuration
+    _DEFAULT_SCROLLBARS = "both"
+    _VALID_SCROLLBARS = "vertical", "horizontal", "both", "neither"