How to Disable the “Skip Payment” button in the Last Shopping Cart Step in Kentico

If you want to Disable(hide) the “Skip Payment” Button in the Last Shopping Cart Step (ButtonBack control)  edit the ShoppingCartPaymentGateway.ascx.cs (you can find it at ~\CMSModules\Ecommerce\Controls\ShoppingCart\ShoppingCartPaymentGateway.ascx.cs) with the following Code:
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this.ShoppingCartControl.ButtonBack.Visible = false;