Fixed typos in frame and dialog,

Some improvemnts to DnD,
  It's no longer possible to close any
    frame if there is a dialog open.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4390 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/dnd/dnd.cpp

@@ -877,6 +877,11 @@ void DnDFrame::OnLeftDown(wxMouseEvent &WXUNUSED(event) )
     {
         // start drag operation
         wxTextDataObject textData(m_strText);
+/*
+        wxFileDataObject textData;
+	textData.AddFile( "/file1.txt" );
+	textData.AddFile( "/file2.txt" );
+*/
         wxDropSource source(textData, this
 #ifdef __WXMSW__
                             ,wxCURSOR_PENCIL,            // for copy