VueJS Dropdown

<b-form-radio-group v-model="toateMagazineleSelectate">
  <b-form-radio-group v-model="tipMagazinSelectat" id="magazine" name="magazine">
    <b-form-group v-for="(tipMagazin,index2) in magazine" :key="index2" class="magazine" name="magazine">
      <div class="tipMagazin divCheckbox" v-if="tipMagazin.clasificare !== ''">
        <div class="col-md-11 textTipMagazinSelect">
          {{tipMagazin.clasificare}}
          <span :id="'tipMagazin'+index2" v-b-toggle="'collapse-'+ index2" class="divIcon">
            <!-- <span class="collapseIcon" ></span> -->
          </span>
        </div>
      </div>
      <b-collapse :id="'collapse-'+ index2" class="collapseBox" visible >
        <b-form-radio-group v-model="model.magazine" class="magazine" name="magazine">
          <div v-for="(magazin,index) in tipMagazin.subclasificari" :key="index" class="divMagazine tipMagazin divCheckbox col-md-12">
            <div class="col-md-11 textMagazinSelect">
              {{magazin}}
            </div>
            <b-form-radio
              :checked="magazin === model.subclasificare"
              :value="{ subclasificare: magazin, clasificare: tipMagazin.clasificare}"
              class="tipMagazinCheck magazine"
              @change="changeMagazine(tipMagazin.clasificare, magazin)">
            </b-form-radio>
          </div>
        </b-form-radio-group>
      </b-collapse>
    </b-form-group>
  </b-form-radio-group>
</b-form-radio-group>