title: How to use a typescript enum value in an Angular2 ngSwitch statement
body: <p>The Typescript enum seems a natural match with Angular2's ngSwitch directive.  But when I try to use an enum in my component's template, I get "Cannot read property 'xxx' of undefined in ...".  How can I use enum values in my component template?</p>
  
  <p>Please note that this is different from how to create html select options based upon ALL of the values of an enum (ngFor).  This question is about ngSwitch based upon a particular value of an enum.  Although the same approach of creating an class-internal reference to the enum appears.</p>