diff --git a/include/wx/osx/window.h b/include/wx/osx/window.h
index caee9c1659..b192b44b47 100644
--- a/include/wx/osx/window.h
+++ b/include/wx/osx/window.h
@@ -91,7 +91,8 @@ public:
     virtual bool SetForegroundColour( const wxColour &colour ) wxOVERRIDE;
 
     virtual bool SetBackgroundStyle(wxBackgroundStyle style) wxOVERRIDE;
-
+    virtual bool IsTransparentBackgroundSupported(wxString* reason = NULL) const wxOVERRIDE;
+    
     virtual int GetCharHeight() const wxOVERRIDE;
     virtual int GetCharWidth() const wxOVERRIDE;
     
diff --git a/src/osx/cocoa/nonownedwnd.mm b/src/osx/cocoa/nonownedwnd.mm
index 9a7bb661e6..b21d2d2e14 100644
--- a/src/osx/cocoa/nonownedwnd.mm
+++ b/src/osx/cocoa/nonownedwnd.mm
@@ -778,6 +778,13 @@ long style, long extraStyle, const wxString& WXUNUSED(name) )
     
     if ( !(style & wxFRAME_TOOL_WINDOW) )
         [m_macWindow setHidesOnDeactivate:NO];
+    
+    if ( GetWXPeer()->GetBackgroundStyle() == wxBG_STYLE_TRANSPARENT )
+    {
+        [m_macWindow setOpaque:NO];
+        [m_macWindow setAlphaValue:1.0];
+        [m_macWindow setBackgroundColor:[NSColor clearColor]];
+    }
 }
 
 void wxNonOwnedWindowCocoaImpl::Create( wxWindow* WXUNUSED(parent), WXWindow nativeWindow )
diff --git a/src/osx/nonownedwnd_osx.cpp b/src/osx/nonownedwnd_osx.cpp
index 3f46bca9e2..d8883120ac 100644
--- a/src/osx/nonownedwnd_osx.cpp
+++ b/src/osx/nonownedwnd_osx.cpp
@@ -152,7 +152,8 @@ bool wxNonOwnedWindow::Create(wxWindow *parent,
     wxWindowCreateEvent event(this);
     HandleWindowEvent(event);
 
-    SetBackgroundColour(wxSystemSettings::GetColour( wxSYS_COLOUR_APPWORKSPACE ));
+    if ( GetBackgroundStyle() != wxBG_STYLE_TRANSPARENT )
+        SetBackgroundColour(wxSystemSettings::GetColour( wxSYS_COLOUR_APPWORKSPACE ));
 
     if ( parent )
         parent->AddChild(this);
diff --git a/src/osx/window_osx.cpp b/src/osx/window_osx.cpp
index 8ec3e2500a..a8242fc83c 100644
--- a/src/osx/window_osx.cpp
+++ b/src/osx/window_osx.cpp
@@ -518,6 +518,11 @@ bool wxWindowMac::SetBackgroundStyle(wxBackgroundStyle style)
     return true;
 }
 
+bool wxWindowMac::IsTransparentBackgroundSupported(wxString* WXUNUSED(reason)) const
+{
+    return true;
+}
+
 bool wxWindowMac::SetBackgroundColour(const wxColour& col )
 {
     if (m_growBox)