Editing behavior of Contact Sign In iPart
Hi! I'm trying to add something to the authentication workflow of the Contact Sign In iPart but it seems to refer to things that are not visible. For example I can see the aspx files in iParts\Contact Management\ContactSignIn such as ContactSignInDisplay.ascx, but I don't see the Codebehind, ContactSignInDisplay.ascx.cs, which I assume is in DLL.
Is it possible to see the codebehind source and guides on augmenting the sign-in flow, or is it necessary to write a new sign in portal from scratch?