Mulitple sorting requests in ListGrid

[msimun]

Hi,

I would like to please you with help of my problem.

I'm using smartGWT version 2.4 and I want to implement custom server side paging in ListGrid, for that purpose when user click on next page, I receive next data page and set it to ListGrid in this method of my list grid (data list contains all data I want to have in listGrid):

ResultSet dataResultSet = new ResultSet();
dataResultSet.setDataSource(getDataSource());
dataResultSet.setFetchMode(FetchMode.PAGED);
dataResultSet.setUseClientFiltering(false);
dataResultSet.setUseClientSorting(false);
dataResultSet.setInitialData(data.toArray(new Record[0]));
dataResultSet.setResultSize(endRow - startRow + 1);
setDataPageSize(endRow - startRow + 1);
setData(dataResultSet);

Data items are correctly set in ListGrid and also filtering is working correctly, the problem is with sorting, when I click on sorting in listGrid (or call sort() directly on listGrid), smartClient creates 2 requests. First request has startRow 0, endRow = pageSize - 1, that is correct request. Second request has startRow 980 and endRow 1000, this request shouldn't be invoked and it's not clear for me why was created

When I set dataResultSet.setResultSize(1000); it works correclty, but the problem is that when I setData with created dataSet next time, smartClient creates also 2 requests.

I think I'm missing something in my ResultSet but can not find the problem there.

Could you please advice me where can be problem or have can I solve it?

Thanks a lot for answers