make wxNO_BORDER work with wxRadioBox (patch 1525406)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45049 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/radiobox.cpp

@@ -253,6 +253,12 @@ bool wxRadioBox::Create( wxWindow *parent, wxWindowID id, const wxString& title,
 
     m_widget = GTKCreateFrame(title);
     wxControl::SetLabel(title);
+    if ( HasFlag(wxNO_BORDER) )
+    {
+        // If we don't do this here, the wxNO_BORDER style is ignored in Show()
+        gtk_frame_set_shadow_type(GTK_FRAME(m_widget), GTK_SHADOW_NONE);
+    }
+
 
     // majorDim may be 0 if all trailing parameters were omitted, so don't
     // assert here but just use the correct value for it