Datepicker Suitelet

Hello,

I'm just getting start on Suitelets and need some help:

In one of our Client Scripts when the user clicks on a button they are prompted to enter a date which is then processed by the script to update the record.
Currently I'm using a Javascript prompt() together with nlapiStringToDate, but for better usability I'd like to replace this with a datepicker using NetSuite's UI elements.

I got as far as creating and deploying the following Suitelet script:

function selectDateForm(request, response)  {     if(request.getMethod() == 'GET')     {          var dateForm = nlapiCreateForm('Select Date', true);          dateForm.addField('custpage_newdate', 'date');          dateForm.addSubmitButton();          response.writePage(dateForm);     }     else         dumpResponse(request, response);  }