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Undo dont work on manual cell.edit

I set the grid editable to false because it should only be editable when the user click on a button.
i made it editable by executing this function

        function rowEditMode ( row_id )
        {
            editors = [ ];
            main_grid.forEachCell ( row_id, function ( cell )
                {
                 editors.push ( cell );
                 cell.edit ();
                }
            );        
        }

then turn it back to read only mode executing this function

        function rowReadOnlyMode ()
        {
            for ( var i = 0; i < editors.length; i++ ) editors[ i ].detach ();     
        }

but when cancel link is clicked undo wont work getUndo(). length returns 0 even though I edited a couple of fields in the row

        function undoChanges ()
        {
            var _count = main_grid.getUndo ().length;
            
            alert("undo count "+ _count);
                        
            for ( var i = 0; i < _count; i++ ) main_grid.doUndo ();
            
        }

The undo functionality stores list of updates based on in-grid events.
In your case the edit functionality switched directly on cell level, so there is no any grid-level events generated, and undo functionality can't collect necessary info.
You can add some code to inform undo functionality about updates.
        function rowReadOnlyMode ()
        {
            for ( var i = 0; i < editors.length; i++ ) {
                    editors[ i ].detach ();     
                    main_grid._onEditUndoRedo(2,row_id,i,editors[ i ].val,editors[ i ].getValue());
             }
        }