How do I add a visualforce page to an out-of-the-box page for Lead details?

Question

I have developed a visualforce page + controller that fetches and displays data from a back end REST server for a given lead.

How do I add this page to the lead details page layout so that everyone,who can see the lead, can see it?

Answer 1

You need to use a Standard Controller and an extension.

Markup

<apex:page standardController="Lead" extensions="MyExtension">

Code

public with sharing class MyExtension
{
    public MyExtension(ApexPages.StandardController controller)
    {
    }
}

The extension itself is optional, but if you want to include your page as a custom button or on the Layout, you absolutely must use the appropriate standardController attribute on your <apex:page> tag. See also: Use Visualforce Pages in Page Layouts and Mobile Cards