fix(exposeAsideWhen): give content time to initialize

Closes #2693.

Author: ajoslin

Diff for: js/angular/directive/exposeAsideWhen.js

@@ -39,8 +39,7 @@
  * For a complete side menu example, see the
  * {@link ionic.directive:ionSideMenus} documentation.
  */
-IonicModule
-.directive('exposeAsideWhen', ['$window', function($window) {
+IonicModule.directive('exposeAsideWhen', ['$window', '$timeout', function($window, $timeout) {
   return {
     restrict: 'A',
     require: '^ionSideMenus',
@@ -61,7 +60,7 @@ IonicModule
         $scope.$apply(checkAsideExpose);
       }, 300, false);
 
-      checkAsideExpose();
+      $scope.$evalAsync(checkAsideExpose);
 
       ionic.on('resize', onResize, $window);