That feature was available only for scrollableDataTable in 3.3.x.
In 4.x extended and scrollable tables were unified to combine features alltogether so extendedDataTable in RF 4 allows that.
Thanks for your quick reply.
But If I use RF 4.x then in File upload section I have a proble, like UploadEvent and UploadItem classes are not there. I can use FileUploadEvent to get the uploaded file. But I can not use UploadedFile class instead of UploadItem because I have few checkings like 'isTempFile', 'getFile().length()' which is there in UploadItem but not in UploadedFile.
So if you have any suggestion regarding this then it will be helpful to me.