diff --git a/include/wx/defs.h b/include/wx/defs.h
index f773f1c6c1..dc12e2af95 100644
--- a/include/wx/defs.h
+++ b/include/wx/defs.h
@@ -1359,6 +1359,10 @@ enum wxBorder
 #define wxFRAME_EX_CONTEXTHELP  0x00000004
 #define wxDIALOG_EX_CONTEXTHELP 0x00000004
 
+/*  Draw the window in a metal theme on Mac */
+#define wxFRAME_EX_METAL                0x00000040
+#define wxDIALOG_EX_METAL               0x00000040
+
 /*  Create a window which is attachable to another top level window */
 #define wxFRAME_DRAWER          0x0020
 
diff --git a/src/mac/carbon/toplevel.cpp b/src/mac/carbon/toplevel.cpp
index 7f7bc298af..618ef034b7 100644
--- a/src/mac/carbon/toplevel.cpp
+++ b/src/mac/carbon/toplevel.cpp
@@ -925,6 +925,9 @@ bool wxTopLevelWindowMac::Create(wxWindow *parent,
     MacCreateRealWindow( title, pos , size , MacRemoveBordersFromStyle(style) , name ) ;
 
     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE));
+    
+    if (GetExtraStyle() & wxFRAME_EX_METAL)
+        MacSetMetalAppearance(true);
 
     wxTopLevelWindows.Append(this);