diff --git a/src/os2/radiobox.cpp b/src/os2/radiobox.cpp
index 1241756dd0..fe73e02070 100644
--- a/src/os2/radiobox.cpp
+++ b/src/os2/radiobox.cpp
@@ -646,7 +646,6 @@ void wxRadioBox::DoSetSize(
                           ,(LONG)nMaxHeight
                           ,SWP_ZORDER | SWP_SIZE | SWP_MOVE | SWP_SHOW
                          );
-        GetParent()->Refresh();
         //
         // Where do we put the next button?
         //
diff --git a/src/os2/window.cpp b/src/os2/window.cpp
index 5bbfaf1fde..1fbe379798 100644
--- a/src/os2/window.cpp
+++ b/src/os2/window.cpp
@@ -394,6 +394,10 @@ bool wxWindowOS2::Create(
                   _T("wxStaticBox can't be used as a window parent!") );
 #endif // wxUSE_STATBOX
 
+     // Ensure groupbox backgrounds are painted
+     if (IsKindOf(CLASSINFO(wxPanel)))
+         lStyle &= ~wxCLIP_CHILDREN;
+
     if ( !CreateBase( pParent
                      ,vId
                      ,rPos