handling dblclicked string_grid cell

Use the onDblClick event. To figure out the cell clicked on you do this in 

the handler: 

  var 
    pt: TPoint; 
    acol, arow: Integer; 
  begin 
    GetCursorPos( pt ); 
    pt:= (Sender as tstringgrid).ScreenToClient( pt ); 
    tstringgrid(sender).MouseToCell( pt.x, pt.y, acol, arow ); 

This works even if the click is on a fixed cell.