diff --git a/ChangeLog b/ChangeLog
index 72fab8a711..c53f9c891e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3635,4 +3635,10 @@
 	* Config.mk:  Defined DELIM to be either / or \, depending upon
 	  CONFIG_WINDOWS_NATIVE.  This will allow me to eliminate a lot of
 	  conditional logic elsewhere.
+	* nuttx/graphics: One a mouse button is pressed, continue to report all
+	  mouse button events to the first window that received the the initial
+	  button down event, even if the mouse attempts to dray outside the
+	  window. From Petteri Aimonen.
+	* nuttx/graphics/nxmu/nx_block.c:  One more fixe to the NX block message
+	  logic from Petteri Aimonen.
 
diff --git a/graphics/nxmu/nx_block.c b/graphics/nxmu/nx_block.c
index 3a051f9d7d..7b198613c6 100644
--- a/graphics/nxmu/nx_block.c
+++ b/graphics/nxmu/nx_block.c
@@ -140,7 +140,7 @@ int nx_block(NXWINDOW hwnd, FAR void *arg)
        * that it will not be blocked.
        */
 
-      ret = nxmu_sendserver(wnd->conn, &outmsg, sizeof(struct nxbe_window_s));
+      ret = nxmu_sendserver(wnd->conn, &outmsg, sizeof(struct nxsvrmsg_blocked_s));
     }
 
   return ret;
diff --git a/graphics/nxmu/nxmu_mouse.c b/graphics/nxmu/nxmu_mouse.c
index 3ebe062d29..93441cc01f 100644
--- a/graphics/nxmu/nxmu_mouse.c
+++ b/graphics/nxmu/nxmu_mouse.c
@@ -61,9 +61,10 @@
  * Private Data
  ****************************************************************************/
 
-static struct nxgl_point_s g_mpos;
-static struct nxgl_point_s g_mrange;
-static uint8_t             g_mbutton;
+static struct nxgl_point_s   g_mpos;
+static struct nxgl_point_s   g_mrange;
+static uint8_t               g_mbutton;
+static struct nxbe_window_s *g_mwnd;
 
 /****************************************************************************
  * Public Data
@@ -154,6 +155,7 @@ int nxmu_mousein(FAR struct nxfe_state_s *fe,
   struct nxbe_window_s *wnd;
   nxgl_coord_t x = pos->x;
   nxgl_coord_t y = pos->y;
+  uint8_t oldbuttons;
   int ret;
 
   /* Clip x and y to within the bounding rectangle */
@@ -182,20 +184,36 @@ int nxmu_mousein(FAR struct nxfe_state_s *fe,
     {
       /* Update the mouse value */
 
-      g_mpos.x  = x;
-      g_mpos.y  = y;
-      g_mbutton = buttons;
+      oldbuttons = g_mbutton;
+      g_mpos.x   = x;
+      g_mpos.y   = y;
+      g_mbutton  = buttons;
 
-      /* Pick the window to receive the mouse event.  Start with
-       * the top window and go down.  Stop with the first window
-       * that gets the mouse report
+      /* If a button is already down, regard this as part of a mouse drag
+       * event. Pass all the following events to the window where the drag
+       * started in.
+       */
+
+      if (oldbuttons && g_mwnd && g_mwnd->cb->mousein)
+        {
+          struct nxclimsg_mousein_s outmsg;
+          outmsg.msgid   = NX_CLIMSG_MOUSEIN;
+          outmsg.wnd     = g_mwnd;
+          outmsg.buttons = g_mbutton;
+          nxgl_vectsubtract(&outmsg.pos, &g_mpos, &g_mwnd->bounds.pt1);
+
+          return nxmu_sendclient(g_mwnd->conn, &outmsg, sizeof(struct nxclimsg_mousein_s));
+        }
+
+      /* Pick the window to receive the mouse event.  Start with the top
+       * window and go down.  Stop with the first window that gets the mouse
+       * report
        */
 
       for (wnd = fe->be.topwnd; wnd; wnd = wnd->below)
         {
-          /* The background window normally has no callback structure
-           * (unless a client has taken control of the background via
-           * nx_requestbkgd()).
+          /* The background window normally has no callback structure (unless
+           * a client has taken control of the background via nx_requestbkgd()).
            */
 
           if (wnd->cb)
@@ -207,6 +225,8 @@ int nxmu_mousein(FAR struct nxfe_state_s *fe,
                 }
             }
         }
+
+      g_mwnd = wnd;
     }
 
   return OK;
diff --git a/graphics/nxsu/nx_mousein.c b/graphics/nxsu/nx_mousein.c
index bee4a22650..5b268358bf 100644
--- a/graphics/nxsu/nx_mousein.c
+++ b/graphics/nxsu/nx_mousein.c
@@ -62,9 +62,10 @@
  * Private Data
  ****************************************************************************/
 
-static struct nxgl_point_s g_mpos;
-static struct nxgl_point_s g_mrange;
-static uint8_t             g_mbutton;
+static struct nxgl_point_s   g_mpos;
+static struct nxgl_point_s   g_mrange;
+static uint8_t               g_mbutton;
+static struct nxbe_window_s *g_mwnd;
 
 /****************************************************************************
  * Public Data
@@ -148,6 +149,7 @@ int nx_mousein(NXHANDLE handle, nxgl_coord_t x, nxgl_coord_t y, uint8_t buttons)
 {
   FAR struct nxfe_state_s *fe = (FAR struct nxfe_state_s *)handle;
   struct nxbe_window_s *wnd;
+  uint8_t oldbuttons;
   int ret;
 
   /* Clip x and y to within the bounding rectangle */
@@ -176,13 +178,27 @@ int nx_mousein(NXHANDLE handle, nxgl_coord_t x, nxgl_coord_t y, uint8_t buttons)
     {
       /* Update the mouse value */
 
+      oldbuttons = g_mbutton;
       g_mpos.x  = x;
       g_mpos.y  = y;
       g_mbutton = buttons;
 
-      /* Pick the window to receive the mouse event.  Start with
-       * the top window and go down.  Step with the first window
-       * that gets the mouse report
+      /* If a button is already down, regard this as part of a mouse drag
+       * event. Pass all the following events to the window where the drag
+       * started in.
+       */
+
+      if (oldbuttons && g_mwnd && g_mwnd->cb->mousein)
+        {
+          struct nxgl_point_s relpos;
+          nxgl_vectsubtract(&relpos, &g_mpos, &g_mwnd->bounds.pt1);
+          g_mwnd->cb->mousein((NXWINDOW)g_mwnd, &relpos, g_mbutton, g_mwnd->arg);
+          return OK;
+        }
+
+      /* Pick the window to receive the mouse event.  Start with the top
+       * window and go down.  Step with the first window that gets the mouse
+       * report
        */
 
       for (wnd = fe->be.topwnd; wnd; wnd = wnd->below)
@@ -193,6 +209,8 @@ int nx_mousein(NXHANDLE handle, nxgl_coord_t x, nxgl_coord_t y, uint8_t buttons)
               break;
             }
         }
+
+      g_mwnd = wnd;
     }
   return OK;
 }
diff --git a/graphics/nxtk/nxtk_events.c b/graphics/nxtk/nxtk_events.c
index aaec16b5af..facf921762 100644
--- a/graphics/nxtk/nxtk_events.c
+++ b/graphics/nxtk/nxtk_events.c
@@ -261,9 +261,20 @@ static void nxtk_mousein(NXWINDOW hwnd, FAR const struct nxgl_point_s *pos,
 
   nxgl_vectoradd(&abspos, pos, &fwnd->wnd.bounds.pt1);
 
+  /* In order to deliver mouse release events to the same window where the
+   * mouse down event happened, we store the initial mouse down location.
+   */
+
+  if (fwnd->mbutton == 0 && buttons != 0)
+    {
+      fwnd->mpos = abspos;
+    }
+
+  fwnd->mbutton = buttons;
+
   /* Is the mouse position inside of the client window region? */
 
-  if (fwnd->fwcb->mousein && nxgl_rectinside(&fwnd->fwrect, &abspos))
+  if (fwnd->fwcb->mousein && nxgl_rectinside(&fwnd->fwrect, &fwnd->mpos))
     {
       nxgl_vectsubtract(&relpos, &abspos, &fwnd->fwrect.pt1);
       fwnd->fwcb->mousein((NXTKWINDOW)fwnd, &relpos, buttons, fwnd->fwarg);
@@ -271,7 +282,7 @@ static void nxtk_mousein(NXWINDOW hwnd, FAR const struct nxgl_point_s *pos,
 
   /* If the mouse position inside the toobar region? */
 
-  else if (fwnd->tbcb->mousein && nxgl_rectinside(&fwnd->tbrect, &abspos))
+  else if (fwnd->tbcb->mousein && nxgl_rectinside(&fwnd->tbrect, &fwnd->mpos))
     {
       nxgl_vectsubtract(&relpos, &abspos, &fwnd->tbrect.pt1);
       fwnd->tbcb->mousein((NXTKWINDOW)fwnd, &relpos, buttons, fwnd->tbarg);
diff --git a/graphics/nxtk/nxtk_internal.h b/graphics/nxtk/nxtk_internal.h
index 87a098845a..3a31215d83 100644
--- a/graphics/nxtk/nxtk_internal.h
+++ b/graphics/nxtk/nxtk_internal.h
@@ -72,6 +72,11 @@ struct nxtk_framedwindow_s
   struct nxgl_rect_s fwrect;
   FAR const struct nx_callback_s *fwcb;
   FAR void *fwarg;
+
+  /* Initial mouse down location */
+
+  uint8_t mbutton;
+  struct nxgl_point_s mpos;
 };
 
 /****************************************************************************