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diff --git a/nuttx/graphics/nxbe/nxbe_lower.c b/nuttx/graphics/nxbe/nxbe_lower.c
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+++ b/nuttx/graphics/nxbe/nxbe_lower.c
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+/****************************************************************************
+ * graphics/nxbe/nxbe_lower.c
+ *
+ *   Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stddef.h>
+#include <debug.h>
+
+#include <nuttx/nx/nxglib.h>
+#include "nxbe.h"
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nxbe_lower
+ *
+ * Description:
+ *   Lower the specified window to the bottom of the display.
+ *
+ ****************************************************************************/
+
+void nxbe_lower(FAR struct nxbe_window_s *wnd)
+{
+  FAR struct nxbe_state_s  *be = wnd->be;
+  FAR struct nxbe_window_s *below;
+
+  /* If the window is already at the bottom, then there is nothing to do */
+
+  if (!wnd->below || wnd->below == &be->bkgd)
+    {
+      return;
+    }
+
+  /* Remove the window from its current position in the list */
+
+  wnd->below->above = wnd->above;
+
+  /* Was it at the top of the display? */
+
+  if (wnd->above)
+    {
+      /* No... it was in the middle somewhere */
+
+      wnd->above->below = wnd->below;
+    }
+  else
+    {
+      /* Yes.. set the new top window */
+
+      be->topwnd        = wnd->below;
+      be->topwnd->above = NULL;
+    }
+
+  /* Remember the window that was just below us */
+
+  below = wnd->below;
+
+  /* Then put the lowered window at the bottom (just above the background window) */
+
+  wnd->below     = &be->bkgd;
+  wnd->above     = be->bkgd.above;
+  be->bkgd.above = wnd;
+
+  /* Redraw the windows that were below us (but now are above) */
+
+  nxbe_redrawbelow(be, below, &wnd->bounds);
+}