问如何停止关闭剑道MultiColumnDropDown，直到完成选择项目？

EN

select: function(e) {
  e.sender.element.data('fromSelect', true);
},
close: function(e) {
  if (e.sender.element.data('fromSelect')) {
    e.preventDefault();
    e.sender.element.data('fromSelect', null);
  }
}

$(document).ready(function() {
  LoadMCDD(MCDDData());
});

function LoadMCDD(ds) {
  let a = ds[0].DropData;
  let arr = a.split('|');
  let obj = [];

  for (let i = 0; i < arr.length; i++) {
    obj.push({
      DropData: arr[i]
    });
  }

  $('#MCDDForPrompt').empty();
  $('#MCDDForPrompt').kendoMultiColumnComboBox({
    placeholder: "Select...",
    dataTextField: "DropData",
    dataValueField: "DropData",
    height: 300,
    autoClose: false,
    columns: [{
        template: "<center><input type='checkbox' class='checkbox' /></center>",
        width: "30px"
      },
      {
        field: "DropData",
        title: "Data",
        width: 200
      }
    ],
    dataSource: {
      data: obj,
    },
    select: function(e) {
      e.sender.element.data('fromSelect', true);
    },
    close: function(e) {
      if (e.sender.element.data('fromSelect')) {
        e.preventDefault();
        e.sender.element.data('fromSelect', null);
      }
    }
  });
}


function MCDDData() {
  let ds = [{
    Answer: "",
    DefaultAnswer: "",
    DropData: "Check 1|Check 2|Check 3|Check 4",
  }];

  return ds;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://kendo.cdn.telerik.com/2018.3.1017/js/kendo.all.min.js"></script>
<link rel="stylesheet" href="https://kendo.cdn.telerik.com/2018.3.1017/styles/kendo.common-bootstrap.min.css" />
<link rel="stylesheet" href="https://kendo.cdn.telerik.com/2018.3.1017/styles/kendo.bootstrap.min.css" />

<div id="MCDDForPrompt" style="width:400px"></div>