Custom fields and save value

I create a new custom field, that I can use in form editor, and that I see on forms. But any of this values are saved in entries, and not received in hooks.

This is the code that I use to create button.

add_action("gform_field_input", "interes_checkbox", 10, 5);

function interes_checkbox($input, $field, $value, $lead_id, $form_id)
{

	global $wp;
    if($field["type"] == "custominteres")
    {
    	// mostrara checkboxes en 3 columnes respecte a la taxonomia interes.
    	if(IS_ADMIN)
    	{
    		$input = "Categories taxonomies interés";
    	}
    	else {

    	$input = "<div class=\"ginput_container\">\n";
    	$input .= "<ul class=\"gfield_checkbox\" id=\"input_".$field['formId']."_".$field['id']."\">\n";
    	$taxonomies= get_terms('interes','orderby=count&hide_empty=0');
    	$indx_li = 1;
    	foreach ($taxonomies as $ataxo)
    	{
    		$input.="<li class=\"gchoice_".$field['id']."_".$indx_li."\">";
    		$input.="<input name=\"input_".$field['id'].".".$indx_li."\" type=\"checkbox\" value=\"".$ataxo->term_id."\" id=\"choice_".$field['id']."_".$indx_li."\">";
    		$input .= "<label for=\"choice_".$field['id']."_".$indx_li."\">".$ataxo->name."</label>";
    		$input.="</li>";
    		$indx_li++ ;
    	}
    	$input .= "</ul>";
    	$input .= print_r($value,true);
    	$input .= print_r($field,true);
    	$input .= "</div>";
    	}

    }

    return $input;
}

function add_clist_field($field_groups){

	// Custom Fields Group
	$field_groups[] = array(
		'name' => 'custom_interes',
		'label' => 'Extras',
		'fields' => array(
			array(
				'class' => 'button',
				'value' => 'Interes',
				'onclick' => "StartAddField('custominteres');"
			)
		)
	);
    return $field_groups;
}
add_filter("gform_add_field_buttons", "add_clist_field");

All work correct but not checkbox values saved in entris.

An if I use this hook, no checkbox retrieved in $entry

add_action("gform_after_submission", "set_post_content", 10, 2);

function set_post_content($entry, $form){

	$data = print_r($entry,true);
	$data .= print_r($form,true);
        mail("david@examples.com","Values",$data,"From:info@examples.com");

}

Where is the problem?