Dropdown value reverts to first choice

Created a dropdown with the javascript code below.  Regardless of what the user selects, the displayed value returns to the first option in the list.  I have no idea what I am missing or have done wrong.

this.getField("Dropdown").setItems([" ", "Not Applicable", "Code A - Child was never determined eligible for Early Steps and did not have\nan IEP.", "Code B - After Early Steps provided personally identifying information to the\nschool district, child/family could not be located by the school district\n(after repeated contact attempts).", "Code C - School district did not get consent from the family for Part B evaluation\n(or family withdrew consent.)", "Code D - Early Steps shared identifying information with the school district less than\n90 days before the child's third birthday.", "Code E - Process was delayed until after the child's third birthday due to\nparent/family reasons (e.g., parent/family repeatedly did not bring child to evaluation,\nparent/family repeatedly did not attend eligibility meetings, child/family illness)", "Code F - Process was delayed until after the child's third birthday due to\nincomplete medical or other agency reports (DCF) needed for eligibility\ndetermination (does not include school district delays in arranging medical\nevaluations).", "Code G - Child was evaluated prior to third birthday and determined ineligible for\nPart B services.", "Code H - Parent declined the transition conference, eligibility meeting or Part B\n services (even if child was evaluated and eligible for Part B). ", "Code I - Child moved out of the school district prior to evaluation or\neligibility determination or never enrolled in school district after being determined\neligible for Part B services.", "Code J - Natural Disaster (e.g., hurricane).", "Code K - Other: (see below)", "Code L - Child unknown to school district or not referred by Early Steps."]);