Views exposed taxonomy exposed filter show "Content Taxonomy Tree" or "Taxonomy Term Reference Tree Widget" structure

Well Recently I came across the situation that the View exposed taxonomy field should show like "Content Taxonomy Tree" or "Taxonomy Term Reference Tree Widget"  . It took quite sometime to figure out what to do. When i Figured it out i decide to write a little bit about it. Following steps will help you to achieve this. 

1) You need install the module Taxonomy Term Reference Tree Widget 

2) You should have the view with taxonomy field field as exposed.

3) Copy and paste the following code on your custom module. 

	<?php
	/**
	* Implementing hook_form_alter()
	* @param $form
	* @param $form_state
	* @param $form_id
	*/
	function YOUR_MODULE_NAME_form_alter(&$form, $form_state, $form_id) {
	if ($form_id == 'views_exposed_form') {
	$term_reference_tree_path = drupal_get_path('module', 'term_reference_tree');
	// You should give , your exposed taxonomy field
	$form['your-toxonomy-field'] = array(
	//s'#title' => t('Tree'),
	'#type' => 'checkbox_tree',
	'#max_choices' => 999,
	'#max_depth' => 999,
	'#field_name' => 'custom_name',
	// '#leaves_only' => 1,
	'#start_minimized' => TRUE,
	'#depth' => 0,
	'#vocabulary' => taxonomy_vocabulary_load(3), // instead of '3', Your vocabulary term ID
	'#parent_tid' => 0,
	'#value_key' => 'tid',
	'#select_parents' => TRUE,
	'#attached' => array(
	'js' => array($term_reference_tree_path . '/term_reference_tree.js'),
	'css' => array($term_reference_tree_path . '/term_reference_tree.css')
	),
	'#attributes' => array('class' => array('field-widget-term-reference-tree')),
	'#element_validate' => array('_term_reference_tree_widget_validate'),
	'#value' => array(),
	'#filter_view' => '',
	'#token_display' => ''
	);
	}
	}

view raw view_exposed_taxonomy_show_taxonmy_tree.php hosted with ❤ by GitHub

4) You should change the 

      YOUR_MODULE_NAME  to your custom module name 

     your-toxonomy-field to your exposed taxonomy field

     '#vocabulary' => taxonomy_vocabulary_load(3),  Instead '3' you should keep your vocabulary  ID.