add_filter( 'gform_pre_render_4', 'populate_radio' );
add_filter( 'gform_pre_validation_4', 'populate_radio' );
add_filter( 'gform_pre_submission_filter_4', 'populate_radio' );
add_filter( 'gform_admin_pre_render_4', 'populate_radio' );
function populate_radio( $form ) {

    foreach( $form['fields'] as &$field )  {

       if ( $field->type != 'radio' || strpos( $field->cssClass, 'primarycolor' ) === false ) {
            continue;
        }
         $args1 = array(
         'showposts' => -1,
         'post_type' =>  'color',
         'orderby' => 'title',
         'order' => 'ASC'
    );
    $postslist = get_posts( $args1 );

        $choices = array();
        $input_id = 1;
        foreach ( $postslist as $post ) {

            if ( $input_id % 10 == 0 ) {
                $input_id++;
            }
            $colorname = get_post_meta($post->ID, '_pc_color_color_name', true);
            $colorcode = get_post_meta($post->ID, '_pc_color_color_code', true);
            $choices[] = array( 'text' => $colorname, 'value' => $colorname );
            $inputs[] = array( 'label' => $colorname, 'id' => "{$field_id}.{$input_id}");
               $input_id++;
        }
        $field->choices = $choices;
         $field->inputs = $inputs;

     }

    return $form;
}