ng-show not working in angularjs

Question

   {{showSubHeader}}
            <div ng-show="showSubHeader" class="topPull" draggable >
            <button class="button-icon ion-bag"></button>
                           </div>       
        </div>  

The expressions {{showSubHeader}} changes from true to false and false to true just fine.

showSubHeader has a boolean value .

ie showSubHeader=true or showSubHeader=false

The value changes are being picked up by angular . As I change the value, I see in console that ng-show expression changes but it does not hide the element even if it is ng-show="false".

How do I fix this? What seems wrong?>

Edit: draggable is a directive that looks like this:

.directive('draggable', function ($animate) {
  return function(scope, element) {
       var startX = 0, startY = 0, x = 0, y = 0;

        var el = element[0];
        console.log(el)
        el.draggable = true;
        element.css({
       position: 'relative',
       cursor: 'pointer'
      });
        el.addEventListener(
            'dragstart',
            function(e) {


          element.addClass("animated slideInDown")
                return false;
            },
            false
        );

        el.addEventListener(
            'dragend',
            function(e) {

          element.addClass("animated slideInUp")
             scope.checkBill();
                return false;
            },
            false
        );
    }
})

checkBill

$scope.checkBill= function(){
    $scope.$apply(function(){
       $scope.showSubHeader=false;

    })
     $state.go('menu.TotalBill', {}, {inherit: true, notify:true})
  }

Answer 1

Try :

<div ng-show="showSubHeader === true" class="topPull" draggable >
      <button class="button-icon ion-bag"></button>
</div>       

Answer 2

You can try to isolate ng-show:

<div ng-show="showSubHeader">
    <div class="topPull" draggable >
        <button class="button-icon ion-bag"></button>
    </div>       
</div>