Hi Azhar,

Sidebar and header menu are contained in controller.js file:

(view large version)

So you can set 

$rootScope.layoutOptions.horizontalMenu.isVisible = false;
$rootScope.layoutOptions.sidebar.isVisible = false;

This is how we use to hide header and sidebar in our demo here:

http://themes.laborator.co/xenon/angular/#/app/layout-and-skins

I hope this will help you.