Strange behaviour after upgrading from Beta 13 to 14

I’ve the following line of code, and in the controller I set the $scope.showFilters = true;

It is working fine on Beta 13, but doesn’t work on Beta 14, the button gets “hide” class and doesn’t show !

<button ng-show="showFilters" menu-toggle="right" class="button button-icon icon ion-funnel"></button>

There is probably other code affecting it. I added it to this Codepen and I see it showing: http://codepen.io/anon/pen/pvdwPR?editors=101

The weird thing that when I use :

<button menu-toggle="left" class="button button-icon icon ion-navicon"></button>

the button disappear because it gets “hide” class!

But when I use

<button class="button button-icon icon ion-navicon"></button>

The button appears fine!

So, what would make menu-toggle add “hide” class?! That happens in both left and right!

OK, I found the cause of the problem here and the solution here:
http://ionicframework.com/docs/api/directive/menuToggle/

Button Hidden On Child Views
By default, the menu toggle button will only appear on a root level side-menu page. Navigating in to child views will hide the menu-toggle button. They can be made visible on child pages by setting the enable-menu-with-back-views attribute of the ionSideMenus directive to true.