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wp_enqueue_script('wplink');
wp_enqueue_style( 'editor-buttons' ); 

// ADD LINK PICKER
function add_link_picker() {
    require_once ABSPATH . "wp-includes/class-wp-editor.php";
    _WP_Editors::wp_link_dialog(); ?>

    <script type="text/javascript">
        var ajaxurl = "<?php echo admin_url( 'admin-ajax.php'); ?>";
        jQuery(document).ready(function ($){
            jQuery('.wpt_set_custom_link').click(function (){
		        wpLink.open($(this).prev('input').attr('id')); 
		    });
        })
    </script><?php
}
add_action('admin_footer', 'add_link_picker');