Good points! Integration is completely customizable. The bar is optional, and you're free to programmatically call up the grid using breakpoints defined in your code. If you do choose to integrate the bar, it can be completely customized to fit the style of your app. It can also be placed on the top of your interface if this is more appropriate.

We're allowing complete customization so that the developers that know their users best can decide how to implement it in their apps.