diff --git a/assets/text/TODO b/assets/text/TODO
index 6845e94..2c275ab 100644
--- a/assets/text/TODO
+++ b/assets/text/TODO
@@ -5,12 +5,19 @@
 5)  Arbitrary {format,palette}s ({4,8} bit ANSI/mIRC, etc.)
 6)  Hotkey & graphical interfaces to {composed,parametrised} tools
 7)  Incremental auto{load,save} & {backup,restore} (needs Settings window)
-8)  GUI: a) switch from wxPython to GTK b) {copy,cut,insert from,paste}, {de,in}crease cell size c) MRU {directories,files}
-9)  Layers, layout (e.g. for comics, zines, etc.) & asset management (e.g. kade, lion, etc.) & traits w/ {inserting,merging,linking}
-10) Sprites & scripted (Python?) animation on the basis of asset traits and {composable,parametrised} patterns (metric flow, particle system, rigging, ...)
-11) Composition and parametrisation of tools from higher-order operators (brushes, filters, outlines, patterns & shaders) and unit tools; unit tools:
+8)  Layers, layout (e.g. for comics, zines, etc.) & asset management (e.g. kade, lion, etc.) & traits w/ {inserting,merging,linking}
+9)  Sprites & scripted (Python?) animation on the basis of asset traits and {composable,parametrised} patterns (metric flow, particle system, rigging, ...)
+10) Composition and parametrisation of tools from higher-order operators (brushes, filters, outlines, patterns & shaders) and unit tools; unit tools:
     a) geometric primitives (arrow, circle, cloud/speech bubble, curve, heart, hexagon, line, pentagon, polygon, rhombus, triangle, square, star)
     b) regions (crop, duplicate, erase, fill, invert, measure, pick, rotate, scale, select, shift, slice, tile, translate)
     c) text (edit, Unicode sets)
+11) GUI:
+    a) {copy,cut,insert from,paste}, {de,in}crease cell size
+    b) replace logo w/ canvas panel in About dialogue
+    c) switch from wxPython to GTK
+    d) fix underscore rendering
+    e) MRU {directories,files}
+    f) ruler
+12) fix outstanding {re,un}do bugs
 
 vim:ff=dos tw=0
diff --git a/libgui/GuiCanvasWxBackend.py b/libgui/GuiCanvasWxBackend.py
index 7839ce8..61f99c9 100644
--- a/libgui/GuiCanvasWxBackend.py
+++ b/libgui/GuiCanvasWxBackend.py
@@ -44,9 +44,13 @@ class GuiCanvasWxBackend():
         fontDc = wx.MemoryDC(); fontDc.SelectObject(fontBitmap);
         fontDc.SetTextForeground(wx.Colour(Colours[patch[0]][:4]))
         fontDc.SetTextBackground(wx.Colour(Colours[patch[1]][:4]))
-        fontDc.SetBrush(brushBg); fontDc.SetBackground(brushBg); fontDc.SetPen(pen);
-        fontDc.SetFont(self._font)
-        fontDc.DrawRectangle(0, 0, *self.cellSize); fontDc.DrawText(patch[3], 0, 0);
+        fontDc.SetBrush(brushBg); fontDc.SetPen(self._pens[patch[1]]);
+        fontDc.DrawRectangle(0, 0, *self.cellSize)
+        fontDc.SetBackground(brushBg); fontDc.SetPen(pen); fontDc.SetFont(self._font);
+        if patch[3] == "_":
+            fontDc.DrawLine(0, self.cellSize[1] - 1, self.cellSize[0], self.cellSize[1] - 1)
+        else:
+            fontDc.DrawText(patch[3], 0, 0)
         eventDc.Blit(*absPoint, *self.cellSize, fontDc, 0, 0)
     # }}}
     # {{{ _finiBrushesAndPens(self)
@@ -58,7 +62,7 @@ class GuiCanvasWxBackend():
     # {{{ _getBrushPatchColours(self, patch)
     def _getBrushPatchColours(self, patch):
         if (patch[0] != -1) and (patch[1] != -1):
-            brushBg, brushFg, pen = self._brushes[patch[0]], self._brushes[patch[1]], self._pens[patch[1]]
+            brushBg, brushFg, pen = self._brushes[patch[1]], self._brushes[patch[1]], self._pens[patch[1]]
         elif (patch[0] == -1) and (patch[1] == -1):
             brushBg, brushFg, pen = self._brushes[1], self._brushes[1], self._pens[1]
         elif patch[0] == -1:
@@ -70,7 +74,7 @@ class GuiCanvasWxBackend():
     # {{{ _getCharPatchColours(self, patch)
     def _getCharPatchColours(self, patch):
         if (patch[0] != -1) and (patch[1] != -1):
-            brushBg, brushFg, pen = self._brushes[patch[1]], self._brushes[patch[0]], self._pens[patch[1]]
+            brushBg, brushFg, pen = self._brushes[patch[1]], self._brushes[patch[0]], self._pens[patch[0]]
         elif (patch[0] == -1) and (patch[1] == -1):
             brushBg, brushFg, pen = self._brushes[1], self._brushes[1], self._pens[1]
         elif patch[0] == -1: