toggle element visibility in ember js based on a boolen

I have created template and controller both called navbar. The code that i have in controller is simply

import Ember from 'ember';

export default Ember.Controller.extend({
    isLogged: true,
});

and that in template is

    
        Login
        Join now
    
        Dashboard
    
<button class="uk-button uk-button-large uk-button-primary uk-width-1-1" disabled=>Test button</button>

The same does not seem to be working. Am i going wrong somewhere ?

The template and controller were generated using ember generator itself and the code above is the only modifications that i made.