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Blackberry WebWorks UI - why is callback not invoked?
function onDateTimeSelected(datetime){
  localStorage.setItem('countup_date', datetime);
}

function dateTimeAsync(htmlDateTimeInput) {
  try {
    var opts = { "value" : htmlDateTimeInput.value,
                  "min"   : htmlDateTimeInput.min || "",
                  "max"   : htmlDateTimeInput.max || "",
    };


    blackberry.ui.dialog.dateTimeAsync("date", opts, window.onDateTimeSelected);
  }catch (e) {
    alert("Exception in dateTimeAsync: " + e);
  }
}