diff --git a/src/mac/carbon/combobox.cpp b/src/mac/carbon/combobox.cpp
index 6ae9d105c1..2341937b42 100644
--- a/src/mac/carbon/combobox.cpp
+++ b/src/mac/carbon/combobox.cpp
@@ -311,7 +311,12 @@ wxString wxComboBox::GetValue() const
 
 void wxComboBox::SetValue(const wxString& value)
 {
-    SetStringSelection( value ) ;
+    int s = FindString (value);
+    if (s == wxNOT_FOUND && !HasFlag(wxCB_READONLY) )
+    {
+    	m_choice->Append(value) ;
+    }
+	SetStringSelection( value ) ;
 }
 
 // Clipboard operations
diff --git a/src/mac/combobox.cpp b/src/mac/combobox.cpp
index 6ae9d105c1..2341937b42 100644
--- a/src/mac/combobox.cpp
+++ b/src/mac/combobox.cpp
@@ -311,7 +311,12 @@ wxString wxComboBox::GetValue() const
 
 void wxComboBox::SetValue(const wxString& value)
 {
-    SetStringSelection( value ) ;
+    int s = FindString (value);
+    if (s == wxNOT_FOUND && !HasFlag(wxCB_READONLY) )
+    {
+    	m_choice->Append(value) ;
+    }
+	SetStringSelection( value ) ;
 }
 
 // Clipboard operations