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Get grid row open/close state

I have used one example from KB to open a sub row using event "rowOnSelect".
But I cannot figure out how I can check that a row is already open so that I could close it.
Just like the plus/minus functionality. Right now i have:
mygrid.attachEvent("onRowSelect",function(id){
        if (mygrid.cells(id,0).open) mygrid.cells(id,0).open();
     return true;
    });

Please help. Thank you.


---

Simon Siewior

You can try to use 
mygrid.attachEvent("onRowSelect",function(id){ 
  if (mygrid.cells(id,0).open){ //check that subrow exist
       if (mygrid.getRowById(id)._expanded)
            mygrid.cells(id,0).close()
       else 
            mygrid.cells(id,0).open()
  }
  return true; 
});

It worked like a charm,

Thank you for help!!!