+#if USE_ERASE_RECT
+    // we must erase everything first, otherwise the garbage
+    // from the old sash is left when dragging it
+    gtk_paint_flat_box
+    (
+        win->m_wxwindow->style,
+        GTK_PIZZA(win->m_wxwindow)->bin_window,
+        GTK_STATE_NORMAL,
+        GTK_SHADOW_NONE,
+        NULL,
+        win->m_wxwindow,
+        (char *)"viewportbin", // const_cast
+        erase_rect.x,
+        erase_rect.y,
+        erase_rect.width,
+        erase_rect.height
+    );
+#endif
+
+
+    // leave some margin before sash itself
+    position += SASH_MARGIN / 2;
+
+    // and finally draw it using GTK paint functions
+    typedef void (*GtkPaintLineFunc)(GtkStyle *, GdkWindow *,
+                                                GtkStateType,
+                                                GdkRectangle *, GtkWidget *,
+                                                gchar *,
+                                                gint, gint, gint);
+
+    GtkPaintLineFunc func = isVert ? gtk_paint_vline : gtk_paint_hline;
+
+    (*func)
+    (
+        win->m_wxwindow->style,
+        GTK_PIZZA(win->m_wxwindow)->bin_window,
+        GTK_STATE_NORMAL,
+        NULL,
+        win->m_wxwindow,
+        (char *)"paned", // const_cast
+        0, isVert ? size.y : size.x, position + SASH_SIZE / 2 - 1
+    );
+
+    gtk_paint_box
+    (
+        win->m_wxwindow->style,
+        GTK_PIZZA(win->m_wxwindow)->bin_window,
+        GTK_STATE_NORMAL,
+        GTK_SHADOW_OUT,
+        (GdkRectangle*) NULL,
+        win->m_wxwindow,
+        (char *)"paned", // const_cast
+        isVert ? position : size.x - 2*SASH_SIZE,
+        isVert ? size.y - 2*SASH_SIZE : position,
+        SASH_SIZE, SASH_SIZE
+    );
+}
+
+void
+wxRendererGTK::DrawDropArrow(wxWindow *WXUNUSED(win),
+                             wxDC& dc,
+                             const wxRect& rect,
+                             int flags)
+{
+    GtkWidget *button = GetButtonWidget();
+
+    // If we give GTK_PIZZA(win->m_wxwindow)->bin_window as
+    // a window for gtk_paint_xxx function, then it won't
+    // work for wxMemoryDC. So that is why we assume wxDC
+    // is wxWindowDC (wxClientDC, wxMemoryDC and wxPaintDC
+    // are derived from it) and use its m_window.
+    wxWindowDCImpl * const impl = wxDynamicCast(dc.GetImpl(), wxWindowDCImpl);
+    wxCHECK_RET( impl, "must have a window DC" );
+
+    GdkWindow* gdk_window = impl->GetGDKWindow();
+
+    // draw arrow so that there is even space horizontally
+    // on both sides
+    int arrowX = rect.width/4 + 1;
+    int arrowWidth = rect.width - (arrowX*2);
+
+    // scale arrow's height accoording to the width
+    int arrowHeight = rect.width/3;
+    int arrowY = (rect.height-arrowHeight)/2 +
+                 ((rect.height-arrowHeight) & 1);
+
+    GtkStateType state;
+
+    if ( flags & wxCONTROL_PRESSED )
+        state = GTK_STATE_ACTIVE;
+    else if ( flags & wxCONTROL_DISABLED )
+        state = GTK_STATE_INSENSITIVE;
+    else if ( flags & wxCONTROL_CURRENT )
+        state = GTK_STATE_PRELIGHT;
+    else
+        state = GTK_STATE_NORMAL;
+
+    // draw arrow on button
+    gtk_paint_arrow
+    (
+        button->style,
+        gdk_window,
+        state,
+        flags & wxCONTROL_PRESSED ? GTK_SHADOW_IN : GTK_SHADOW_OUT,
+        NULL,
+        button,
+        "arrow",
+        GTK_ARROW_DOWN,
+        FALSE,
+        rect.x + arrowX,
+        rect.y + arrowY,
+        arrowWidth,
+        arrowHeight
+    );