diff --git a/include/wx/cocoa/dc.h b/include/wx/cocoa/dc.h
index ed39d574e9..c9cc225042 100644
--- a/include/wx/cocoa/dc.h
+++ b/include/wx/cocoa/dc.h
@@ -58,7 +58,12 @@ protected:
     void CocoaUnwindStackAndLoseFocus();
 // DC flipping/transformation
     void CocoaApplyTransformations();
+    void CocoaUnapplyTransformations();
     WX_NSAffineTransform m_cocoaWxToBoundsTransform;
+// Get bounds rect (for Clear())
+    // note: we use void * to mean NSRect * so that we can avoid
+    // putting NSRect in the headers.
+    virtual bool CocoaGetBounds(void *rectData);
 // Blitting
     virtual bool CocoaDoBlitOnFocusedDC(wxCoord xdest, wxCoord ydest,
         wxCoord width, wxCoord height, wxCoord xsrc, wxCoord ysrc,
diff --git a/include/wx/cocoa/dcclient.h b/include/wx/cocoa/dcclient.h
index b7c56ab412..5bfc6a15e9 100644
--- a/include/wx/cocoa/dcclient.h
+++ b/include/wx/cocoa/dcclient.h
@@ -27,8 +27,6 @@ public:
     wxWindowDC(wxWindow *win);
     ~wxWindowDC(void);
 
-    // NSView specific functions
-    virtual void Clear();
 protected:
     wxWindow *m_window;
     WX_NSView m_lockedNSView;
@@ -37,6 +35,7 @@ protected:
     virtual bool CocoaUnlockFocus();
     bool CocoaLockFocusOnNSView(WX_NSView nsview);
     bool CocoaUnlockFocusOnNSView();
+    virtual bool CocoaGetBounds(void *rectData);
 };
 
 class wxClientDC: public wxWindowDC
diff --git a/include/wx/cocoa/dcmemory.h b/include/wx/cocoa/dcmemory.h
index 1265fb84dd..889b5ce9bd 100644
--- a/include/wx/cocoa/dcmemory.h
+++ b/include/wx/cocoa/dcmemory.h
@@ -23,14 +23,13 @@ public:
     ~wxMemoryDC(void);
     virtual void SelectObject(const wxBitmap& bitmap);
     virtual void DoGetSize(int *width, int *height) const;
-
-    virtual void Clear();
 protected:
     wxBitmap m_selectedBitmap;
     WX_NSImage m_cocoaNSImage;
 // DC stack
     virtual bool CocoaLockFocus();
     virtual bool CocoaUnlockFocus();
+    virtual bool CocoaGetBounds(void *rectData);
 // Blitting
     virtual bool CocoaDoBlitOnFocusedDC(wxCoord xdest, wxCoord ydest,
         wxCoord width, wxCoord height, wxCoord xsrc, wxCoord ysrc,
diff --git a/src/cocoa/dc.mm b/src/cocoa/dc.mm
index da2d539def..7ef93f80ee 100644
--- a/src/cocoa/dc.mm
+++ b/src/cocoa/dc.mm
@@ -185,6 +185,23 @@ void wxDC::CocoaApplyTransformations()
     // TODO: Apply device/logical/user position/scaling transformations
 }
 
+void wxDC::CocoaUnapplyTransformations()
+{
+    // NOTE: You *must* call this with focus held.
+    // Undo all transforms so we're back in true Cocoa coords with
+    // no scaling or flipping.
+    NSAffineTransform *invertTransform;
+    invertTransform = [m_cocoaWxToBoundsTransform copy];
+    [invertTransform invert];
+    [invertTransform concat];
+}
+
+bool wxDC::CocoaGetBounds(void *rectData)
+{
+    // We don't know what we are so we can't return anything.
+    return false;
+}
+
 void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 {
     wxAutoNSAutoreleasePool pool;
@@ -553,6 +570,22 @@ void wxDC::SetTextBackground( const wxColour &col )
 
 void wxDC::Clear()
 {
+    if(!CocoaTakeFocus()) return;
+
+    NSRect boundsRect;
+    if(!CocoaGetBounds(&boundsRect)) return;
+
+    NSGraphicsContext *context = [NSGraphicsContext currentContext];
+    [context saveGraphicsState];
+
+    // Undo all transforms so when we draw our bounds rect we
+    // really overwrite our bounds rect.
+    CocoaUnapplyTransformations();
+
+    [m_backgroundBrush.GetNSColor() set];
+    [NSBezierPath fillRect:boundsRect];
+
+    [context restoreGraphicsState];
 }
 
 void wxDC::SetBackground(const wxBrush& brush)
diff --git a/src/cocoa/dcclient.mm b/src/cocoa/dcclient.mm
index bcf82d7aab..d6ca05bc5e 100644
--- a/src/cocoa/dcclient.mm
+++ b/src/cocoa/dcclient.mm
@@ -80,17 +80,15 @@ bool wxWindowDC::CocoaUnlockFocus()
     return CocoaUnlockFocusOnNSView();
 }
 
-void wxWindowDC::Clear()
+bool wxWindowDC::CocoaGetBounds(void *rectData)
 {
-    if(!CocoaTakeFocus()) return;
-
-    NSGraphicsContext *context = [NSGraphicsContext currentContext];
-    [context saveGraphicsState];
-
-    [m_backgroundBrush.GetNSColor() set];
-    [NSBezierPath fillRect:[m_lockedNSView bounds]];
-
-    [context restoreGraphicsState];
+    if(!rectData)
+        return false;
+    if(!m_lockedNSView)
+        return false;
+    NSRect *pRect = (NSRect*)rectData;
+    *pRect = [m_lockedNSView bounds];
+    return true;
 }
 
 /*
diff --git a/src/cocoa/dcmemory.mm b/src/cocoa/dcmemory.mm
index f3f2d3e2d0..fb11593b35 100644
--- a/src/cocoa/dcmemory.mm
+++ b/src/cocoa/dcmemory.mm
@@ -151,20 +151,16 @@ bool wxMemoryDC::CocoaDoBlitOnFocusedDC(wxCoord xdest, wxCoord ydest,
     return false;
 }
 
-void wxMemoryDC::Clear()
+bool wxMemoryDC::CocoaGetBounds(void *rectData)
 {
-    if(!CocoaTakeFocus()) return;
-
-    NSGraphicsContext *context = [NSGraphicsContext currentContext];
-    [context saveGraphicsState];
-
-    [m_backgroundBrush.GetNSColor() set];
-    NSRect rect;
-    rect.origin.x = 0;
-    rect.origin.y = 0;
-    rect.size = [m_cocoaNSImage size];
-    [NSBezierPath fillRect:rect];
-
-    [context restoreGraphicsState];
+    if(!rectData)
+        return false;
+    if(!m_cocoaNSImage)
+        return false;
+    NSRect *pRect = (NSRect*)rectData;
+    pRect->origin.x = 0.0;
+    pRect->origin.y = 0.0;
+    pRect->size = [m_cocoaNSImage size];
+    return true;
 }