Hot to get value/text pairs form kendo dropdown using JavaScript or Jquery

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Javascript

jQuery

Kendo

I am using kendo dropdown like

//html
<input id="field_timezone" style="width: 275px;" tabindex="4">  

//js
resultList = $.parseJSON(response.d);   //data via ajax call

$("#field_timezone").kendoDropDownList({
    dataTextField: "TimeZoneDescription",
    dataValueField: "TimeZoneID",
    dataSource: resultList,
    optionLabel: {
        TimeZoneDescription: "Choose",
        TimeZoneID: ""
    }
});

I am trying to find, what value/text pairs or options should be displayed on the dropdown

Things I have tried

alert(JSON.stringify($('#field_timezone').data('kendoDropDownList').dataSource.data()));
//or
alert(JSON.stringify($('#field_timezone').data('kendoDropDownList').dataSource._data));

gives the list used for datasource, but it's missing the "Choose"option,

And no option to find out which fields are been used for value or text