diff --git a/wxPython/contrib/gizmos/_gizmos_rename.i b/wxPython/contrib/gizmos/_gizmos_rename.i
index 1fc7fcc790..b01e44ad3d 100644
--- a/wxPython/contrib/gizmos/_gizmos_rename.i
+++ b/wxPython/contrib/gizmos/_gizmos_rename.i
@@ -30,6 +30,7 @@
 %rename(TL_SEARCH_FULL)                     wxTL_SEARCH_FULL;
 %rename(TL_SEARCH_PARTIAL)                  wxTL_SEARCH_PARTIAL;
 %rename(TL_SEARCH_NOCASE)                   wxTL_SEARCH_NOCASE;
+%rename(TR_DONT_ADJUST_MAC)                 wxTR_DONT_ADJUST_MAC;
 %rename(TreeListColumnInfo)                 wxTreeListColumnInfo;
 
 #endif
diff --git a/wxPython/contrib/gizmos/gizmos.i b/wxPython/contrib/gizmos/gizmos.i
index 5e7044221c..fea136cb3b 100644
--- a/wxPython/contrib/gizmos/gizmos.i
+++ b/wxPython/contrib/gizmos/gizmos.i
@@ -40,8 +40,8 @@
 
 %import windows.i
 %import controls.i
-%pythoncode { wx = _core }
-%pythoncode { __docfilter__ = wx.__DocFilter(globals()) }
+%pythoncode { import wx }
+%pythoncode { __docfilter__ = wx._core.__DocFilter(globals()) }
 
 
 MAKE_CONST_WXSTRING2(DynamicSashNameStr,     wxT("dynamicSashWindow"));
@@ -443,6 +443,11 @@ enum {
     wxTL_SEARCH_NOCASE
 };
 
+enum {
+    // extra tree styles
+    wxTR_DONT_ADJUST_MAC
+};
+%pythoncode { wx.TR_DONT_ADJUST_MAC = TR_DONT_ADJUST_MAC }
 
 
 class wxTreeListColumnInfo: public wxObject {
diff --git a/wxPython/contrib/gizmos/wxCode/include/wx/treelistctrl.h b/wxPython/contrib/gizmos/wxCode/include/wx/treelistctrl.h
index 0600984616..d92dc7c3b9 100644
--- a/wxPython/contrib/gizmos/wxCode/include/wx/treelistctrl.h
+++ b/wxPython/contrib/gizmos/wxCode/include/wx/treelistctrl.h
@@ -44,6 +44,9 @@ typedef void *wxTreeItemIdValue;
 #endif
 #endif
 
+
+#define wxTR_DONT_ADJUST_MAC    0x0100          // Don't adjust the style for the Mac
+
 //-----------------------------------------------------------------------------
 // wxTreeListColumnAttrs
 //-----------------------------------------------------------------------------
diff --git a/wxPython/contrib/gizmos/wxCode/src/treelistctrl.cpp b/wxPython/contrib/gizmos/wxCode/src/treelistctrl.cpp
index 1fc7349210..e56bb68aa4 100644
--- a/wxPython/contrib/gizmos/wxCode/src/treelistctrl.cpp
+++ b/wxPython/contrib/gizmos/wxCode/src/treelistctrl.cpp
@@ -1868,17 +1868,20 @@ bool wxTreeListMainWindow::Create(wxTreeListCtrl *parent,
                                   const wxString& name )
 {
 #ifdef __WXMAC__
-    int major,minor;
-    wxGetOsVersion( &major, &minor );
+    if ( !(style & wxTR_DONT_ADJUST_MAC))
+    {
+        int major,minor;
+        wxGetOsVersion( &major, &minor );
 
-    if (style & wxTR_HAS_BUTTONS) style |= wxTR_MAC_BUTTONS;
-    if (style & wxTR_HAS_BUTTONS) style &= ~wxTR_HAS_BUTTONS;
-    style &= ~wxTR_LINES_AT_ROOT;
-    style |= wxTR_NO_LINES;
-    if (major < 10)
-        style |= wxTR_ROW_LINES;
+        if (style & wxTR_HAS_BUTTONS) style |= wxTR_TWIST_BUTTONS;
+        if (style & wxTR_HAS_BUTTONS) style &= ~wxTR_HAS_BUTTONS;
+        style &= ~wxTR_LINES_AT_ROOT;
+        style |= wxTR_NO_LINES;
+        if (major < 10)
+            style |= wxTR_ROW_LINES;
+    }
 #endif
-
+    
     wxScrolledWindow::Create( parent, id, pos, size,
                               style|wxHSCROLL|wxVSCROLL, name );
 
diff --git a/wxPython/demo/TreeListCtrl.py b/wxPython/demo/TreeListCtrl.py
index 327a238b7c..6580c07d5a 100644
--- a/wxPython/demo/TreeListCtrl.py
+++ b/wxPython/demo/TreeListCtrl.py
@@ -17,8 +17,15 @@ class TestPanel(wx.Panel):
                                         #wx.TR_TWIST_BUTTONS
                                         #| wx.TR_ROW_LINES
                                         #| wx.TR_NO_LINES 
-                                        | wx.TR_FULL_ROW_HIGHLIGHT     
+                                        | wx.TR_FULL_ROW_HIGHLIGHT
+
+                                        # By default the style will be adjusted on
+                                        # Mac to use twisty buttons and no lines.  If
+                                        # you would rather control this yourself then
+                                        # add this style.
+                                        #| wx.TR_DONT_ADJUST_MAC
                                    )
+
         isz = (16,16)
         il = wx.ImageList(isz[0], isz[1])
         fldridx     = il.Add(wx.ArtProvider_GetBitmap(wx.ART_FOLDER,      wx.ART_OTHER, isz))
diff --git a/wxPython/wxPython/gizmos.py b/wxPython/wxPython/gizmos.py
index fd6c08664a..3709e0d788 100644
--- a/wxPython/wxPython/gizmos.py
+++ b/wxPython/wxPython/gizmos.py
@@ -63,6 +63,7 @@ wxTL_SEARCH_LEVEL = wx.gizmos.TL_SEARCH_LEVEL
 wxTL_SEARCH_FULL = wx.gizmos.TL_SEARCH_FULL
 wxTL_SEARCH_PARTIAL = wx.gizmos.TL_SEARCH_PARTIAL
 wxTL_SEARCH_NOCASE = wx.gizmos.TL_SEARCH_NOCASE
+wxTR_DONT_ADJUST_MAC = wx.gizmos.TR_DONT_ADJUST_MAC
 wxTreeListColumnInfo = wx.gizmos.TreeListColumnInfo
 wxTreeListColumnInfoPtr = wx.gizmos.TreeListColumnInfoPtr
 wxTreeListCtrl = wx.gizmos.TreeListCtrl