add support of wxTE_PROCESS_ENTER (1/2 of patch 1831995)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51036 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/xrc/xh_combo.cpp

@@ -34,6 +34,7 @@ wxComboBoxXmlHandler::wxComboBoxXmlHandler()
     XRC_ADD_STYLE(wxCB_SORT);
     XRC_ADD_STYLE(wxCB_READONLY);
     XRC_ADD_STYLE(wxCB_DROPDOWN);
+    XRC_ADD_STYLE(wxTE_PROCESS_ENTER);
     AddWindowStyles();
 }