angularjs - ui-router nested views do not reload parent controller -

i have nested view own controller. how can load nested view without reloading parent controller?

    .config(function($stateprovider) {         $stateprovider             .state("aaa", {                 views: {                     'aaa': {                         templateurl: "/aaa.html",                         controller: "aaacontroller"                     }                 },                 params: {                     id: null                 },             }).state("aaa.bbb", {                 views: {                     'bbb': {                         templateurl: "/bbb.html",                         controller: "bbbcontroller"                     }                 },                 params: {                     id: null                 }             }); //link     <a ui-sref="aaa.bbb({id: row.getproperty(\'id\')})"></a> 

every time call bbb view aaacontroller gets loaded.