+        if (m_nStartRadioGroup == -1)
+        {
+            //
+            // Start a new radio group
+            //
+            m_nStartRadioGroup = nCount;
+
+            //
+            // For now it has just one element
+            //
+            pItem->SetAsRadioGroupStart();
+            pItem->SetRadioGroupEnd(m_nStartRadioGroup);
+
+            //
+            // Ensure that we have a checked item in the radio group
+            //
+            bCheck = TRUE;
+        }
+        else // extend the current radio group
+        {
+            //
+            // We need to update its end item
+            //
+            pItem->SetRadioGroupStart(m_nStartRadioGroup);
+
+            wxMenuItemList::Node*   pNode = GetMenuItems().Item(m_nStartRadioGroup);
+
+            if (pNode)
+            {
+                pNode->GetData()->SetRadioGroupEnd(nCount);
+            }
+            else
+            {
+                wxFAIL_MSG( _T("where is the radio group start item?") );
+            }
+        }
+    }
+    else // not a radio item
+    {
+        EndRadioGroup();
+    }
+
+    if (!wxMenuBase::DoAppend(pItem) || !DoInsertOrAppend(pItem))
+    {
+        return FALSE;
+    }
+    if (bCheck)
+    {
+        //
+        // Check the item initially
+        //
+        pItem->Check(TRUE);
+    }
+    return TRUE;
+} // end of wxMenu::DoAppend
+
+bool wxMenu::DoInsert(
+  size_t                            nPos
+, wxMenuItem*                       pItem
+)
+{
+    return ( wxMenuBase::DoInsert( nPos
+                                  ,pItem) &&
+             DoInsertOrAppend( pItem
+                              ,nPos
+                             )
+           );
+} // end of wxMenu::DoInsert
+
+wxMenuItem* wxMenu::DoRemove(
+  wxMenuItem*                       pItem
+)