Code example on how to add a tab content section to a lead profile

example.php

<?php


/**
*  Adds events section to a Lead's Activity tab
*/
class Extension_Practice_Add_Lead_Tab {

	static $click_events;
	static $unsubscribe_events;
	
	/**
	*  Initiate class
	*/
	function __construct() {
		self::load_hooks();
	}

	/**
	*  Loads hooks and filters
	*/
	private function load_hooks() {
		
		/* add nav tabs */
		add_filter('wpl_lead_tabs', array( __CLASS__ , 'create_nav_tabs' ) , 10, 1);
		
		/* add inline css & js rules - maybe should consider enqueuing your css and js instead of printing inline */
		add_action('wp_footer', array( __CLASS__ , 'add_js_css' ) , 10);
		
		/* add nav tab content */
		add_action( 'wpl_print_lead_tab_sections' , array( __CLASS__ , 'add_content_container' ) );
		
	}
	
	/**
	*  	Create New Nav Tabs in WordPress Leads - Lead UI
	*/
	public static function create_nav_tabs( $nav_items ) {
		global $post;
		
		
		/* Add attachments tab */
		$nav_items[] = array(
			'id'=> 'wpleads_lead_tab_attachments',
			'label'=> __( 'Attachments' , 'inbound-pro' )
		);
		
		
		return $nav_items;
	}
	
	/**
	*  Prints container content
	*/
	public static function add_content_container() {
		?>
		<div class="lead-profile-section" id="wpleads_lead_tab_attachments" >
			test
		</div>
		<?php
	}
	
	/**
	*  Prints inline css and js
	*/
	public static function add_js_css() {
		global $post;

		/* bail if not wp-lead screen */
		if ( isset($post) && $post->post_type != 'wp-lead' ) {
			return;
		}
		
		/* add supporting js and css here */
	}

	
}

/* Load Post Type Pre Init */
$GLOBALS['Extension_Practice_Add_Lead_Tab'] = new Extension_Practice_Add_Lead_Tab();