exportData method from ListGrid and dataSource doens't export the title

Hello Isomorphic,
I use smartGWT 5.0 version. When I call grid.exportData or datasource.exportData methods the title names was not consider(like in exportClientdata method), and is used the fieldName. BTW, I used 3.1 version and everything worked fine, titles was used in export. Is something changed in implementation? Or can you give me an idea how to export the titles but not to use exportClientdata method?

Thank you.