wijmo怎么合并单元格

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<wj-flex-grid items-source="dataInfoNow" style="height:calc(100% - 70px); margin-top: 70px "  initialized="init(s,e)" resize-column="aaa(s,e)" loaded-rows="loadedRows(s,e)" class="custom-flex-grid">
<wj-flex-grid-column header="事件类型"  width="1*" binding="colEventSecondType" ></wj-flex-grid-column>
<wj-flex-grid-column header="类型所占比例" width="1*" binding="colEventSecondRate" ></wj-flex-grid-column>
<wj-flex-grid-column header="事件父亲"  width="1*"  binding="colEventType" ></wj-flex-grid-column>
<wj-flex-grid-column header="父类所占比例"  width="1*"  binding="colEventRate"  ></wj-flex-grid-column>
</wj-flex-grid>
怎么合并单元格  请附上Demo，谢谢