[AngularJS] Radio button error message won't display

[Mark Giffin]

Using AngularJS v1.6.6.

I have a set of radio buttons and I'm using the code below and I can't get 
the ng-messages to display when I click the Submit button if a radio button 
has not been selected. The code below does not work.

<div class="p fcRadio fcRequired" id="a10000000Radio">
  <label class="control-label" for="a10000000Radio">Required radio button 
list</label>
  <label for="abcradio1">
    <input class="li" id="abcradio1" ng-model="abcradio" 
ng-readonly="formComplete==true" type="radio" name="abcradio" value="Radio 
button 1" required="">Radio button 1</label>
  <div ng-messages="form.abcradio1.$error" ng-show="(form.$submitted || 
form.abcradio1.$touched) &amp;&amp; form.abcradio1.$invalid-required">
    <div ng-messages="required" style="color: red;">Radio button is 
required.</div>
  </div>
  <label for="abcradio2">
    <input class="li outside" id="abcradio2" ng-model="abcradio" 
ng-readonly="formComplete==true" type="radio" name="abcradio" value="Radio 
button 2" required="">Radio button 2</label>
</div>

But a similar setup like below works for checkboxes:

<div class="p fcCheck fcRequired">
  <label class="control-label" for="a1000000Check">Required check 
box</label>
  <input type="checkbox" name="a1000000Check" id="a1000000Check" 
ng-model="a1000000Check" ng-readonly="formComplete==true" required="">
    <div ng-messages="form.a1000000Check.$error" ng-show="(form.$submitted 
|| form.a1000000Check.$touched) &amp;&amp; 
form.a1000000Check.$invalid-required">
      <div ng-messages="required" style="color: red;">Checkbox is 
required.</div>
    </div>
</div>

Thanks,
Mark

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