下拉框

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<template>
<wj-flex-grid :items-source="items">
      <wj-flex-grid-column
         v-for="(column, index) in columns"
         :key="index"
         :header="column.header"
         :binding="column.binding"
      >
<template v-if="column.binding === 'name'">
      <wj-combo-box
            display-member-path="name"
            :itemsSource="countries"
            >
         </wj-combo-box>
</template>
  </wj-flex-grid-column>
</wj-flex-grid>
</template>
<script>
// import { FlexGrid, FlexGridColumn } from '@grapecity/wijmo.vue2.grid';
import "@grapecity/wijmo.vue2.core";
import "@grapecity/wijmo.vue2.input";
import "@grapecity/wijmo.styles/wijmo.css";
import "@grapecity/wijmo.vue2.grid";

export default {
// components: {
//    // WjFlexGrid: FlexGrid,
//    // WjFlexGridColumn: FlexGridColumn,
//    WjComboBox: ComboBox,
// },
  data() {
return {
   countries: [
      { id: 1, name: 'China', capital: 'Beijing' },
      { id: 2, name: 'Japan', capital: 'Tokyo' },
      { id: 3, name: 'South Korea', capital: 'Seoul' },
   ],
   columns: [
      { header: 'Country', binding: 'name' },
      { header: 'Capital', binding: 'capital' },
   ],
   items: [
      { name: 'China', capital: 'Beijing' },
      { name: 'Japan', capital: 'Tokyo' },
      { name: 'South Korea', capital: 'Seoul' },
   ],
   theComboObject: {
         selectedValue: {}
      }
};
  },
};
</script>

代码如上，wijmo单元格中绑定下拉框但是没效果，请问有相关demo嘛