Gravity Forms Custom Fields

gistfile1.php

<?php
add_action("gform_field_input", "ih_gform_field_input", 10, 5);
function ih_gform_field_input($input, $field, $value, $lead_id, $form_id){
	//wp_debug($field);
	if($field["type"] == "vehicleyear"){
		//wp_debug($field['choices']);
    		//$input = 'Aha!';
	}
	return $input;
}

add_filter("gform_add_field_buttons", "ih_gform_add_field_buttons");
function ih_gform_add_field_buttons($field_groups){
	unset($field_groups[2]);
	unset($field_groups[3]);
	$field_groups[] = array(
		'name' => 'ih_fields',
		'label' => 'Insurance Hero Fields',
		'fields' => array(
			array(
				'class' => 'button',
				'value' => 'Vehicle Year',
				'onclick' => "StartAddField('vehicleyear');"
			),
			array(
				'class' => 'button',
				'value' => 'Vehicle Make',
				'onclick' => "StartAddField('select')"
			),
			array(
				'class' => 'button',
				'value' => 'Vehicle Model',
				'onclick' => "StartAddField('select')"
			)
		)
	);
	return $field_groups;
}

add_filter("gform_predefined_choices", "ih_gform_predefined_choices");
function ih_gform_predefined_choices($choices){
   $choices["My New Choice"] = array("Choice 1", "Choice 2", "Choice 3");
   return $choices;
}

add_filter("gform_admin_pre_render", 'ih_gform_admin_pre_render');
function ih_gform_admin_pre_render($form){
	//wp_debug($form,true);
	foreach($form['fields'] as $i => $field){
		if($field['type'] == 'vehicleyear'){
			
			$form['fields'][$i]['displayAllCategories'] = true;
			//$form['fields'][$i]['displayCaption'] = true;
			//$form['fields'][$i]['displayDescription'] = true;
			//$form['fields'][$i]['displayTitle'] = true;
			
			$form['fields'][$i]['adminLabel'] = 'Vehichle Year';
			$form['fields'][$i]['adminOnly'] = false;
			//$form['fields'][$i]['displayTitle'] = true;
			
			$form['fields'][$i]['inputType'] = 'select';
			$form['fields'][$i]['inputName'] = 'testingu';
			$form['fields'][$i]['label'] = 'Vehicle Year';
			//$form['fields'][$i]['enableChoiceValue'] = false;
			$form['fields'][$i]['choices'] = array(
				array (
					'text' => 'My Choice',
					'value' => 'My Choice',
					'isSelected' => false,
					'price' => '',
				),
				array (
					'text' => 'Your Choice',
					'value' => 'Your Choice',
					'isSelected' => false,
					'price' => '',
				),
				array (
					'text' => 'His Choice',
					'value' => 'his Choice',
					'isSelected' => false,
					'price' => '',
				),
			);
			//$form['fields'][$i]['choices'] = array(1,2,3);
			//$form['fields'][$i]['type'] = 'select';
		}
		//wp_debug($form['fields'][$i]);
	}
	return $form;
}
?>