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Selecting without loosing previouse selection

I write my custom method wich selects few rows in dhtmlx grid, but selectRow method wich i use clears previouse selections while making new one? Can i select many rows programatically using some API function or not clear previouse selection?

You can select multiple rows by using 

     grid.selectRow(index,false,true);

or

     grid.selectRowById(id,true);

the additional param controls - if new selected row must replace exisitng selection, or must be added to already selected rows

the next commands block , will select 3 records in grid
     grid.selectRow(0,false);
     grid.selectRow(1,false,true);
     grid.selectRow(2,false,true);