Ext.Net 1.2 MultiCombo js清除

 <ext:MultiCombo ID="mcbSelected" runat="server" WrapBySquareBrackets="true" Width="260"
                                        FieldLabel="Selected User" LabelWidth="70" LabelAlign="Right">
      <Items>
      </Items>     
</ext:MultiCombo>

清除代码：

        mcbSelected.store.clearData();
        mcbSelected.reset();