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dhtmlxCalendar not saving month and year

I have a dhtmlxCalendar that is attached to a text field and defined as follows:

<table class="Box" style="vertical-align:top">
<tr>
<td class="CellTitle">EFFECT START</td>
</tr>
<tr>
<td class="CellInput"><input type="text" id="EffectStart" readonly="true"></td>
</tr>
</table>

effectStart = new dhtmlxCalendarObject("EffectStart", false, {
isWinHeader : true, isWinDrag : true, isYearEditable : true, isMonthEditable : true
});

When clicking on the text input, the calendar comes up and the year and month can be edited within the calendar, but after the edit, the calendar stays open and the selected values do not populate the text field.