diff --git a/include/wx/defs.h b/include/wx/defs.h
index 2af9664744..1871ae13e4 100644
--- a/include/wx/defs.h
+++ b/include/wx/defs.h
@@ -1568,9 +1568,8 @@ enum wxBorder
 
 /*
  * wxRadioBox style flags
+ * These styles are not used in any port.
  */
-/*  should we number the items from left to right or from top to bottom in a 2d */
-/*  radiobox? */
 #define wxRA_LEFTTORIGHT    0x0001
 #define wxRA_TOPTOBOTTOM    0x0002
 
diff --git a/interface/wx/defs.h b/interface/wx/defs.h
index 1e1e47431d..2359cdcaab 100644
--- a/interface/wx/defs.h
+++ b/interface/wx/defs.h
@@ -379,9 +379,8 @@ enum wxBorder
 
 /*
  * wxRadioBox style flags
+ * These styles are not used in any port.
  */
-/*  should we number the items from left to right or from top to bottom in a 2d */
-/*  radiobox? */
 #define wxRA_LEFTTORIGHT    0x0001
 #define wxRA_TOPTOBOTTOM    0x0002
 
diff --git a/samples/widgets/radiobox.cpp b/samples/widgets/radiobox.cpp
index 2d109a51fe..048b79ea5a 100644
--- a/samples/widgets/radiobox.cpp
+++ b/samples/widgets/radiobox.cpp
@@ -60,14 +60,6 @@ enum
     RadioPage_Radio
 };
 
-// layout direction radiobox selections
-enum
-{
-    RadioDir_Default,
-    RadioDir_LtoR,
-    RadioDir_TtoB
-};
-
 // default values for the number of radiobox items
 static const unsigned int DEFAULT_NUM_ENTRIES = 12;
 static const unsigned int DEFAULT_MAJOR_DIM = 3;
@@ -123,7 +115,6 @@ protected:
     wxCheckBox *m_chkSpecifyRows;
     wxCheckBox *m_chkEnableItem;
     wxCheckBox *m_chkShowItem;
-    wxRadioBox *m_radioDir;
 
     // the gauge itself and the sizer it is in
     wxRadioBox *m_radio;
@@ -197,8 +188,7 @@ RadioWidgetsPage::RadioWidgetsPage(WidgetsBookCtrl *book,
     m_textLabelBtns =
     m_textLabel = (wxTextCtrl *)NULL;
 
-    m_radio =
-    m_radioDir = (wxRadioBox *)NULL;
+    m_radio = (wxRadioBox *)NULL;
     m_sizerRadio = (wxSizer *)NULL;
 }
 
@@ -217,24 +207,6 @@ void RadioWidgetsPage::CreateContent()
                         "Major specifies &rows count"
                        );
 
-    static const wxString layoutDir[] =
-    {
-        "default",
-        "left to right",
-        "top to bottom"
-    };
-
-    m_radioDir = new wxRadioBox(this, wxID_ANY, "Numbering:",
-                                wxDefaultPosition, wxDefaultSize,
-                                WXSIZEOF(layoutDir), layoutDir,
-                                1, wxRA_SPECIFY_COLS);
-    sizerLeft->Add(m_radioDir, 0, wxGROW | wxALL, 5);
-
-    // if it's not defined, we can't change the radiobox direction
-#ifndef wxRA_LEFTTORIGHT
-    m_radioDir->Disable();
-#endif // wxRA_LEFTTORIGHT
-
     wxSizer *sizerRow;
     sizerRow = CreateSizerWithTextAndLabel("&Major dimension:",
                                            wxID_ANY,
@@ -320,7 +292,6 @@ void RadioWidgetsPage::Reset()
     m_chkSpecifyRows->SetValue(false);
     m_chkEnableItem->SetValue(true);
     m_chkShowItem->SetValue(true);
-    m_radioDir->SetSelection(RadioDir_Default);
 }
 
 void RadioWidgetsPage::CreateRadio()
@@ -371,26 +342,6 @@ void RadioWidgetsPage::CreateRadio()
 
     flags |= GetAttrs().m_defaultFlags;
 
-#ifdef wxRA_LEFTTORIGHT
-    switch ( m_radioDir->GetSelection() )
-    {
-        default:
-            wxFAIL_MSG( "unexpected wxRadioBox layout direction" );
-            wxFALLTHROUGH;
-
-        case RadioDir_Default:
-            break;
-
-        case RadioDir_LtoR:
-            flags |= wxRA_LEFTTORIGHT;
-            break;
-
-        case RadioDir_TtoB:
-            flags |= wxRA_TOPTOBOTTOM;
-            break;
-    }
-#endif // wxRA_LEFTTORIGHT
-
     m_radio = new wxRadioBox(this, RadioPage_Radio,
                              m_textLabel->GetValue(),
                              wxDefaultPosition, wxDefaultSize,
diff --git a/src/univ/radiobox.cpp b/src/univ/radiobox.cpp
index dd3049631b..50883e472f 100644
--- a/src/univ/radiobox.cpp
+++ b/src/univ/radiobox.cpp
@@ -140,28 +140,8 @@ bool wxRadioBox::Create(wxWindow *parent,
                         const wxValidator& wxVALIDATOR_PARAM(val),
                         const wxString& name)
 {
-    // for compatibility with the other ports which don't handle (yet?)
-    // wxRA_LEFTTORIGHT and wxRA_TOPTOBOTTOM flags, we add them ourselves if
-    // not specified
-    if ( !(style & (wxRA_LEFTTORIGHT | wxRA_TOPTOBOTTOM)) )
-    {
-        // horizontal radiobox use left to right layout
-        if ( style & wxRA_SPECIFY_COLS )
-        {
-            style |= wxRA_LEFTTORIGHT;
-        }
-        else if ( style & wxRA_SPECIFY_ROWS )
-        {
-            style |= wxRA_TOPTOBOTTOM;
-        }
-        else
-        {
-            wxFAIL_MSG( wxT("you must specify wxRA_XXX style!") );
-
-            // use default
-            style = wxRA_SPECIFY_COLS | wxRA_LEFTTORIGHT;
-        }
-    }
+    if ( !(style & (wxRA_SPECIFY_ROWS | wxRA_SPECIFY_COLS)) )
+        style |= wxRA_SPECIFY_COLS;
 
     if ( !wxStaticBox::Create(parent, id, title, pos, size, style, name) )
         return false;
@@ -447,7 +427,7 @@ void wxRadioBox::DoMoveWindow(int x0, int y0, int width, int height)
     {
         m_buttons[n]->SetSize(x, y, sizeBtn.x, sizeBtn.y);
 
-        if ( GetWindowStyle() & wxRA_TOPTOBOTTOM )
+        if ( GetWindowStyle() & wxRA_SPECIFY_ROWS )
         {
             // from top to bottom
             if ( (n + 1) % GetRowCount() )
@@ -462,7 +442,7 @@ void wxRadioBox::DoMoveWindow(int x0, int y0, int width, int height)
                 y = y0;
             }
         }
-        else // wxRA_LEFTTORIGHT: mirror the code above
+        else // wxRA_SPECIFY_COLS: mirror the code above
         {
             // from left to right
             if ( (n + 1) % GetColumnCount() )