-    if (bCheck)
-        bOk = (bool)::WinSendMsg( GetHMenuOf(m_parentMenu)
-                                 ,MM_SETITEMATTR
-                                 ,MPFROM2SHORT(GetRealId(), TRUE)
-                                 ,MPFROM2SHORT(MIA_CHECKED, MIA_CHECKED)
-                                );
-    else
-        bOk = (bool)::WinSendMsg( GetHMenuOf(m_parentMenu)
-                                 ,MM_SETITEMATTR
-                                 ,MPFROM2SHORT(GetRealId(), TRUE)
-                                 ,MPFROM2SHORT(MIA_CHECKED, FALSE)
-                                );
+
+    HMENU                           hMenu = GetHmenuOf(m_parentMenu);
+
+    if (GetKind() == wxITEM_RADIO)
+    {
+        //
+        // It doesn't make sense to uncheck a radio item - what would this do?
+        //
+        if (!bCheck)
+            return;
+
+        //
+        // Get the index of this item in the menu
+        //
+        const wxMenuItemList&       rItems = m_parentMenu->GetMenuItems();
+        int                         nPos = rItems.IndexOf(this);
+
+        wxCHECK_RET( nPos != wxNOT_FOUND
+                    ,_T("menuitem not found in the menu items list?")
+                   );
+
+        //
+        // Get the radio group range
+        //
+        int                         nStart;
+        int                         nEnd;
+
+        if (m_bIsRadioGroupStart)
+        {
+            //
+            // We already have all information we need
+            //
+            nStart = nPos;
+            nEnd   = m_vRadioGroup.m_nEnd;
+        }
+        else // next radio group item
+        {
+            //
+            // Get the radio group end from the start item
+            //
+            nStart = m_vRadioGroup.m_nStart;
+            nEnd = rItems.Item(nStart)->GetData()->m_vRadioGroup.m_nEnd;
+        }
+
+        //
+        // Also uncheck all the other items in this radio group
+        //
+        wxMenuItemList::compatibility_iterator node = rItems.Item(nStart);
+
+        for (int n = nStart; n <= nEnd && node; n++)
+        {
+            if (n == nPos)
+            {
+                ::WinSendMsg( hMenu
+                             ,MM_SETITEMATTR
+                             ,MPFROM2SHORT(n, TRUE)
+                             ,MPFROM2SHORT(MIA_CHECKED, MIA_CHECKED)
+                            );
+            }
+            if (n != nPos)
+            {
+                node->GetData()->m_isChecked = FALSE;
+                ::WinSendMsg( hMenu
+                             ,MM_SETITEMATTR
+                             ,MPFROM2SHORT(n, TRUE)
+                             ,MPFROM2SHORT(MIA_CHECKED, FALSE)
+                            );
+            }
+            node = node->GetNext();
+        }
+    }
+    else // check item
+    {
+        if (bCheck)
+            bOk = (bool)::WinSendMsg( hMenu
+                                     ,MM_SETITEMATTR
+                                     ,MPFROM2SHORT(GetRealId(), TRUE)
+                                     ,MPFROM2SHORT(MIA_CHECKED, MIA_CHECKED)
+                                    );
+        else
+            bOk = (bool)::WinSendMsg( hMenu
+                                     ,MM_SETITEMATTR
+                                     ,MPFROM2SHORT(GetRealId(), TRUE)
+                                     ,MPFROM2SHORT(MIA_CHECKED, FALSE)
+                                    );
+    }