diff --git a/include/wx/osx/cocoa/private.h b/include/wx/osx/cocoa/private.h
index 3473aadca9..9a3e131a81 100644
--- a/include/wx/osx/cocoa/private.h
+++ b/include/wx/osx/cocoa/private.h
@@ -210,6 +210,7 @@ public :
     bool SetTransparent(wxByte alpha);
     bool SetBackgroundColour(const wxColour& col );
     void SetExtraStyle( long exStyle );
+    void SetWindowStyleFlag( long style );
     bool SetBackgroundStyle(wxBackgroundStyle style);
     bool CanSetTransparent();
 
diff --git a/include/wx/osx/core/private.h b/include/wx/osx/core/private.h
index 9d3fbdb52f..47c9179bf3 100644
--- a/include/wx/osx/core/private.h
+++ b/include/wx/osx/core/private.h
@@ -685,7 +685,11 @@ public :
     virtual void SetExtraStyle( long WXUNUSED(exStyle) )
     {
     }
-
+    
+    virtual void SetWindowStyleFlag( long WXUNUSED(style) )
+    {
+    }
+    
     virtual bool SetBackgroundStyle(wxBackgroundStyle WXUNUSED(style))
     {
         return false ;
diff --git a/include/wx/osx/nonownedwnd.h b/include/wx/osx/nonownedwnd.h
index e650d7e094..cf537e15ec 100644
--- a/include/wx/osx/nonownedwnd.h
+++ b/include/wx/osx/nonownedwnd.h
@@ -80,6 +80,7 @@ public:
     static void MacDelayedDeactivation(long timestamp);
     virtual void MacActivate( long timestamp , bool inIsActivating ) ;
 
+    virtual void SetWindowStyleFlag(long flags);
 
     virtual void Raise();
     virtual void Lower();
diff --git a/src/osx/cocoa/nonownedwnd.mm b/src/osx/cocoa/nonownedwnd.mm
index c19341742e..b0af31cc07 100644
--- a/src/osx/cocoa/nonownedwnd.mm
+++ b/src/osx/cocoa/nonownedwnd.mm
@@ -533,6 +533,21 @@ void wxNonOwnedWindowCocoaImpl::SetExtraStyle( long exStyle )
     }
 }
 
+void wxNonOwnedWindowCocoaImpl::SetWindowStyleFlag( long style )
+{
+    if (m_macWindow)
+    {
+        CGWindowLevel level = kCGNormalWindowLevel;
+        
+        if (style & wxSTAY_ON_TOP)
+            level = kCGUtilityWindowLevel;
+        else if (( style & wxFRAME_FLOAT_ON_PARENT ) || ( style & wxFRAME_TOOL_WINDOW ))
+            level = kCGFloatingWindowLevel;
+        
+        [m_macWindow setLevel: level];
+    }
+}
+
 bool wxNonOwnedWindowCocoaImpl::SetBackgroundStyle(wxBackgroundStyle WXUNUSED(style))
 {
     return true;
diff --git a/src/osx/nonownedwnd_osx.cpp b/src/osx/nonownedwnd_osx.cpp
index bdc9be1d32..9adc5647d5 100644
--- a/src/osx/nonownedwnd_osx.cpp
+++ b/src/osx/nonownedwnd_osx.cpp
@@ -217,6 +217,17 @@ bool wxNonOwnedWindow::SetBackgroundColour(const wxColour& c )
     return true;
 }
 
+void wxNonOwnedWindow::SetWindowStyleFlag(long flags)
+{
+    if (flags == GetWindowStyleFlag())
+        return;
+        
+    wxWindow::SetWindowStyleFlag(flags);
+    
+    if (m_nowpeer)
+        m_nowpeer->SetWindowStyleFlag(flags);
+}
+
 // Raise the window to the top of the Z order
 void wxNonOwnedWindow::Raise()
 {