How to include a custom window in the setup & deployment wizard?

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C#

.NET

WPF

setup

deployment

I have developed a WPF application so now i have a requirement that i need to protect my application with the product key .

My requirement is when ever user installs my application, In a window it should ask for the email id if user gives then a product id should be sent to the specified email id and in the next window if user enters the product key and email id if the both email id and product key matches then only product should be installed.

I have done the default styles i.e,, in the setup wizard-->adding Textboxes(A).... in the User Interface Editor but i can't able to access the textbox values in my code how to achieve this please help thanks in advance .