diff --git a/collects/mred/private/wx/cocoa/canvas.rkt b/collects/mred/private/wx/cocoa/canvas.rkt
index ad54429629..1628315679 100644
--- a/collects/mred/private/wx/cocoa/canvas.rkt
+++ b/collects/mred/private/wx/cocoa/canvas.rkt
@@ -238,7 +238,6 @@
               is-window-enabled?
               block-mouse-events
               move get-x get-y
-              on-size
               register-as-child
               get-size get-position
               set-focus
@@ -456,7 +455,9 @@
        (fix-dc)
        (when (is-auto-scroll?)
          (reset-auto-scroll 0 0))
-       (on-size 0 0))
+       (on-size))
+
+     (define/public (on-size) (void))
 
      (define/public (show-scrollbars h? v?)
        (let ([h? (and h? hscroll-ok?)]
diff --git a/collects/mred/private/wx/cocoa/frame.rkt b/collects/mred/private/wx/cocoa/frame.rkt
index 525dc73f50..d55d0a28aa 100644
--- a/collects/mred/private/wx/cocoa/frame.rkt
+++ b/collects/mred/private/wx/cocoa/frame.rkt
@@ -63,7 +63,7 @@
         (let ([wx (->wx wxb)])
           (when wx
             (queue-window-event wx (lambda ()
-                                     (send wx on-size 0 0)
+                                     (send wx queue-on-size)
                                      (send wx clean-up)))
             ;; Live resize:
             (constrained-reply (send wx get-eventspace)
@@ -74,7 +74,7 @@
   [-a _void (windowDidMove: [_id notification])
       (when wxb
         (queue-window*-event wxb (lambda (wx)
-                                   (send wx on-size 0 0))))]
+                                   (send wx queue-on-size))))]
   [-a _void (windowDidBecomeMain: [_id notification])
       ;; We check whether the window is visible because
       ;; clicking the dock item tries to resurrect a hidden
diff --git a/collects/mred/private/wx/cocoa/window.rkt b/collects/mred/private/wx/cocoa/window.rkt
index c6b8d1253c..80ce551aaf 100644
--- a/collects/mred/private/wx/cocoa/window.rkt
+++ b/collects/mred/private/wx/cocoa/window.rkt
@@ -591,7 +591,9 @@
             [y (if (= y -11111) (get-y) y)])
         (tellv cocoa setNeedsDisplay: #:type _BOOL #t)
         (tellv cocoa setFrame: #:type _NSRect (make-NSRect (make-NSPoint x (flip y h))
-                                                           (make-NSSize w h)))))
+                                                           (make-NSSize w h))))
+      (queue-on-size))
+
     (define/public (internal-move x y)
       (set-size x y (get-width) (get-height)))
     (define/public (move x y)
@@ -702,7 +704,7 @@
 
     (define/public (on-char s) (void))
     (define/public (on-event m) (void))
-    (define/public (on-size x y) (void))
+    (define/public (queue-on-size) (void))
 
     (define last-l? #f)
     (define last-m? #f)
diff --git a/collects/mred/private/wx/gtk/canvas.rkt b/collects/mred/private/wx/gtk/canvas.rkt
index cf252365d1..1e4f0e6c0f 100644
--- a/collects/mred/private/wx/gtk/canvas.rkt
+++ b/collects/mred/private/wx/gtk/canvas.rkt
@@ -194,7 +194,7 @@
            [gl-config #f])
 
      (inherit get-gtk set-size get-size get-client-size 
-              on-size get-top-win
+              get-top-win
               set-auto-size 
               adjust-client-delta infer-client-delta
               is-auto-scroll? get-virtual-width get-virtual-height
@@ -438,10 +438,9 @@
      (define/override (internal-on-client-size w h)
        (reset-dc))
      (define/override (on-client-size w h) 
-       (let ([xb (box 0)]
-             [yb (box 0)])
-         (get-size xb yb)
-         (on-size (unbox xb) (unbox yb))))
+       (on-size))
+
+     (define/public (on-size) (void))
 
      (define/public (show-scrollbars h? v?)
        (when hscroll-gtk
diff --git a/collects/mred/private/wx/gtk/frame.rkt b/collects/mred/private/wx/gtk/frame.rkt
index 33a57505c0..7575b6547d 100644
--- a/collects/mred/private/wx/gtk/frame.rkt
+++ b/collects/mred/private/wx/gtk/frame.rkt
@@ -139,7 +139,7 @@
           style)
     (init [is-dialog? #f])
 
-    (inherit get-gtk set-size on-size
+    (inherit get-gtk set-size
              pre-on-char pre-on-event
              get-client-delta get-size
              get-parent get-eventspace
diff --git a/collects/mred/private/wx/gtk/window.rkt b/collects/mred/private/wx/gtk/window.rkt
index e4cc352e2a..b878609dce 100644
--- a/collects/mred/private/wx/gtk/window.rkt
+++ b/collects/mred/private/wx/gtk/window.rkt
@@ -420,7 +420,8 @@
         (unless (= h -1) (set! save-h h))
         (set! save-w (max save-w client-delta-w))
         (set! save-h (max save-h client-delta-h))
-        (really-set-size gtk x y save-x save-y save-w save-h)))
+        (really-set-size gtk x y save-x save-y save-w save-h)
+        (queue-on-size)))
 
     (define/public (save-size x y w h)
       (set! save-w w)
@@ -441,13 +442,7 @@
         (set! save-h h)
         (queue-on-size)))
 
-    (define on-size-queued? #f)
-    (define/public (queue-on-size)
-      (unless on-size-queued?
-        (set! on-size-queued? #t)
-        (queue-window-event this (lambda () 
-                                   (set! on-size-queued? #f)
-                                   (on-size 0 0)))))
+    (define/public (queue-on-size) (void))
 
     (define client-delta-w 0)
     (define client-delta-h 0)
@@ -605,8 +600,6 @@
     (define/public (on-char e) (void))
     (define/public (on-event e) (void))
 
-    (define/public (on-size w h) (void))
-
     (define/public (register-child child on?)
       (void))
     (define/public (register-child-in-parent on?)
diff --git a/collects/mred/private/wx/win32/canvas.rkt b/collects/mred/private/wx/win32/canvas.rkt
index c9998f3862..375f950d89 100644
--- a/collects/mred/private/wx/win32/canvas.rkt
+++ b/collects/mred/private/wx/win32/canvas.rkt
@@ -86,8 +86,7 @@
               set-control-font
               is-auto-scroll? get-virtual-width get-virtual-height
               reset-auto-scroll
-              refresh-for-autoscroll
-              on-size)
+              refresh-for-autoscroll)
 
      (define hscroll? (memq 'hscroll style))
      (define vscroll? (memq 'vscroll style))
@@ -241,7 +240,9 @@
                 [h (if (= h -1) (- (RECT-bottom r) (RECT-top r)) h)])
            (MoveWindow canvas-hwnd 0 0 (max 1 (- w COMBO-WIDTH)) h #t)
            (MoveWindow combo-hwnd 0 0 (max 1 w) (- h 2) #t)))
-       (on-size 0 0))
+       (on-size))
+
+     (define/public (on-size) (void))
 
      ;; The `queue-paint' and `paint-children' methods
      ;; are defined by `canvas-mixin' from ../common/canvas-mixin
diff --git a/collects/mred/private/wx/win32/window.rkt b/collects/mred/private/wx/win32/window.rkt
index 6aab5bcab9..67dbfd65e6 100644
--- a/collects/mred/private/wx/win32/window.rkt
+++ b/collects/mred/private/wx/win32/window.rkt
@@ -244,7 +244,7 @@
   (unless (memq 'deleted style)
     (show #t))
   
-  (define/public (on-size w h) (void))
+  (define/public (queue-on-size) (void))
 
   (define/public (on-set-focus) (void))
   (define/public (on-kill-focus) (void))
@@ -314,6 +314,7 @@
         (MoveWindow hwnd x y w h #t))
     (unless (and (= w -1) (= h -1))
       (on-resized))
+    (queue-on-size)
     (refresh))
   (define/public (move x y)
     (set-size x y -1 -1))
diff --git a/collects/mred/private/wxme/editor-canvas.rkt b/collects/mred/private/wxme/editor-canvas.rkt
index a12cbeeba5..43bafcb4ed 100644
--- a/collects/mred/private/wxme/editor-canvas.rkt
+++ b/collects/mred/private/wxme/editor-canvas.rkt
@@ -288,13 +288,16 @@
     (send admin set-canvas #f)
     #|(super ~)|#)
   
-  (define/override (on-size w h)
+  (define/override (on-size)
     (unless noloop?
-      (unless (and (= w lastwidth)
-                   (= h lastheight))
-        (unless (and media
-                     (send media get-printing))
-          (reset-size)))))
+      (unless (and media
+                   (send media get-printing))
+        (let-boxes ([w 0]
+                    [h 0])
+            (get-size w h)
+          (unless (and (= w lastwidth)
+                       (= h lastheight))
+            (reset-size))))))
 
   (define/private (reset-size)
     (reset-visual #f)
diff --git a/collects/mred/private/wxpanel.rkt b/collects/mred/private/wxpanel.rkt
index 99e2017e85..955a8ca7d5 100644
--- a/collects/mred/private/wxpanel.rkt
+++ b/collects/mred/private/wxpanel.rkt
@@ -34,7 +34,6 @@
 	[on-set-focus (lambda () (void))]
 	[on-kill-focus (lambda () (void))]
 	[set-focus (lambda () (void))]
-	[on-size (lambda () (void))]
 	[enable (lambda () (void))]
 	[show (lambda (on?) (void))]
         [is-shown? (lambda () #f)]
diff --git a/collects/mred/private/wxtop.rkt b/collects/mred/private/wxtop.rkt
index cda7b38b39..05513e8427 100644
--- a/collects/mred/private/wxtop.rkt
+++ b/collects/mred/private/wxtop.rkt
@@ -395,8 +395,8 @@
 	;;            aren't stretchable, frame resized to size of
 	;;            contents.  Each direction is handled
 	;;            independently.
-	[on-size
-	 (lambda (bad-width bad-height)
+	[queue-on-size
+	 (lambda ()
 	   (unless (and already-trying? (not (eq? 'unix (system-type))))
 	     (parameterize ([wx:current-eventspace (get-eventspace)])
 	       (wx:queue-callback (lambda () (resized)) #t))))])
diff --git a/collects/mred/private/wxwindow.rkt b/collects/mred/private/wxwindow.rkt
index be3d476669..dc18af233d 100644
--- a/collects/mred/private/wxwindow.rkt
+++ b/collects/mred/private/wxwindow.rkt
@@ -190,29 +190,28 @@
 			 (as-exit
 			  (lambda ()
 			    (send (get-proxy) on-drop-file f)))))]
-	[on-size (lambda (bad-w bad-h)
-		   (super on-size bad-w bad-h)
-		   ;; Delay callback to make sure X structures (position) are updated, first.
-		   ;; Also, Windows needs a trampoline.
-		   (queue-window-callback
-		    this
-		    (entry-point
-		     (lambda ()
-		       (let ([mred (get-mred)])
-			 (when mred 
-			   (let* ([w (get-width)]
-				  [h (get-height)])
-			     (when (not (and (= w old-w) (= h old-h)))
-			       (set! old-w w)
-			       (set! old-h h)
-			       (as-exit (lambda () (send mred on-size w h)))))
-			   (let* ([p (area-parent)]
-				  [x (- (get-x) (or (and p (send p dx)) 0))]
-				  [y (- (get-y) (or (and p (send p dy)) 0))])
-			     (when (not (and (= x old-x) (= y old-y)))
-			       (set! old-x x)
-			       (set! old-y y)
-			       (as-exit (lambda () (send mred on-move x y)))))))))))]
+	[queue-on-size
+         (lambda ()
+           (super queue-on-size)
+           (queue-window-callback
+            this
+            (entry-point
+             (lambda ()
+               (let ([mred (get-mred)])
+                 (when mred 
+                   (let* ([w (get-width)]
+                          [h (get-height)])
+                     (when (not (and (= w old-w) (= h old-h)))
+                       (set! old-w w)
+                       (set! old-h h)
+                       (as-exit (lambda () (send mred on-size w h)))))
+                   (let* ([p (area-parent)]
+                          [x (- (get-x) (or (and p (send p dx)) 0))]
+                          [y (- (get-y) (or (and p (send p dy)) 0))])
+                     (when (not (and (= x old-x) (= y old-y)))
+                       (set! old-x x)
+                       (set! old-y y)
+                       (as-exit (lambda () (send mred on-move x y)))))))))))]
 	[on-set-focus (lambda () 
                         (super on-set-focus)
                         (when expose-focus? (send (get-proxy) on-focus #t)))]