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Need to specify a default sorting

Be default, no sorting is applied to the data loaded in the grid. This is fine, as i don't want to have to do a grid sort after loading. I am loading my data from the server in an ascending sort. So, when i do the column sort for the first time, i expect it to do a 'descending' sort first. However, it currently does an asceding sort first. Is there a way i can tell the grid that the data is already being loaded as in ascending order, so it can do the desc sort first?

You can use next API call
    grid.setSortImgState(true,INDEX,"asc");

where INDEX - index of column by which data sorted, the grid will not change anything in dataset, just will update inner sorting state and will show sort marker at necessary position.