added wxDIRCTRL_EDIT_LABELS style support (patch 1676853) [backport from HEAD]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@44726 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/xrc/xh_gdctl.cpp

@@ -34,6 +34,7 @@ wxGenericDirCtrlXmlHandler::wxGenericDirCtrlXmlHandler()
     XRC_ADD_STYLE(wxDIRCTRL_3D_INTERNAL);
     XRC_ADD_STYLE(wxDIRCTRL_SELECT_FIRST);
     XRC_ADD_STYLE(wxDIRCTRL_SHOW_FILTERS);
+    XRC_ADD_STYLE(wxDIRCTRL_EDIT_LABELS);
     AddWindowStyles();
 }