EXTJS 3.2 editorgrid How to set focus to next cell

from a combo box I get the value to (sat_beli,kon_beli,satuan), I want to set focus to next cell (start edit). Can U help please

Code:

{
                dataIndex : 'kode_sub',
                header : 'Kode Stock',
                width : 160,
                align : 'left',
                editor : {
                    xtype : 'combo',
                    allowBlank : true,
                    mode : 'local',
                    store : ds_stock,
                    selectOnFocus: true,
                    listClass : 'x-combo-list-small',
                    typeAhead : true,
                    displayField : 'kode_sub',
                    itemSelector: 'div.column-center-akun',
                    valueField : 'kode_sub',
                    tpl : resultTpl_stock,
                    listWidth : 600,
                    lazyRender : true,
                    listeners: {
                                select : function(combo,e,rec) // 'select' will be fired as soon as an item in the ComboBox is selected with mouse, keyboard.
                                       {                
                                        var invoice = this.getValue();  // get value from combo
                                           var index = this.getStore().findExact('kode_sub',invoice)  // compare value from combo to field acct_no and returns the index
                                           var record = this.getStore().getAt(index);  // get record at the index
                                          //alert(record);
                                           var processed1 = record.get('sat_beli'); // return value of field acct_name
                                           var processed2 = record.get('konv_beli');
                                           var processed3 = record.get('satuan');
                                           //alert(processed);
                                        var oSM = gridDetail.getSelectionModel();
                                        var oGrid = Ext.getCmp('grid-Detail');
                                        oGrid.startEditing(oSM.getSelectedCell()[0],oSM.getSelectedCell()[1]);
                                        oGrid.getStore().getAt(oSM.getSelectedCell()[0]).set('sat_beli',processed1);
                                        oGrid.getStore().getAt(oSM.getSelectedCell()[0]).set('konv_beli',processed2);
                                        oGrid.getStore().getAt(oSM.getSelectedCell()[0]).set('satuan',processed3);


                                         oGrid.stopEditing(false);
                                        
                                    }
                                                        
                               }


                }
            }

EXTJS 3.2 editorgrid How to set focus to next cell