drawCallback and child().show vs legacy fnOpen

Muhahe

Hi, im confused about behavior of drawCallback and child().show.
Im using createdRow callback to open child row for parent row like this

"createdRow": function (row,data,index){
            if(data.child != null){
                var td = $('td', row).eq(0)
                td.addClass('details-control')
                try{
                    if (showHideItems['p'+data.id] ==true){                   
                        subtablesId.push('p'+data.id)                   
                        var tr = td.closest('tr');                   
                        var nRow = this.api().row( tr );
                        var elem = format(nRow.data())
                        nRow.child(elem).show();
                        tr.addClass('shown');
                    }
                }catch(err){
                    //for IE 
                }
            }
        },

and if i try to reach child row in drawCallback, it isnt here

"drawCallback": function(settings){
           
            if (settings._bInitComplete){
                subtablesId.forEach(function(subtableId){
                    try{
                        initializeSubTable($('#subtable_'+subtableId),allTasksData[subtableId])
                    }catch(error){}
                }) 
            }
            
        },

So child rows appear after drawCallback? or am i missing something? Or is here another callback which is called at same times as drawCallback, but with child().show row visible?

Im 1.9.2 datatables, i was using fnOpen instead of child(),show and new row was here in drawCallback.