Gravity Wiz // Fix Gravity Form Tabindex Conflicts ~ http://gravitywiz.com/fix-gravity-form-tabindex-conflicts/

gw-gravity-form-tabindex-fix.php

<?php
/**
 * Fix Gravity Form Tabindex Conflicts
 * http://gravitywiz.com/fix-gravity-form-tabindex-conflicts/
 */
add_filter( 'gform_tabindex', 'gform_tabindexer', 10, 2 );
function gform_tabindexer( $tab_index, $form = false ) {
    $starting_index = 1000; // if you need a higher tabindex, update this number
    if( $form )
        add_filter( 'gform_tabindex_' . $form['id'], 'gform_tabindexer' );
    return GFCommon::$tab_index >= $starting_index ? GFCommon::$tab_index : $starting_index;
}