How to disable click selected child row in datatable ?

headshot9x

I have use table with child-row. Normal, I selected main row, i use

    $('#table tbody').on('click', 'tr', function () {
                if ($(this).hasClass('selected')) {
                    $(this).removeClass('selected');
                 //do this
                }
                else {
                        table.$('tr.selected').removeClass('selected');
                        $(this).addClass('selected');
                        //do this
                }
            });

When use this, click any child-row, it effect. Now, i want to don't click to child-row, how i do it ?
Look at picture sample. thank you.