Change search from Dropdown to tickboxes?

Hi there,

I am struggling to convert the “dropdown event category search” to a tickbox search! I would like that the user can select multipe categories instead on one category? any help will be MUCH appreciated.

PS. I changed this in category.php

wp_dropdown_categories(array( 'hide_empty' => 0, 'orderby' =>'name', 'name' => 'category', 'hierarchical' => true, 'taxonomy' => EM_TAXONOMY_CATEGORY, 'selected' => $args['category'], 'show_option_none' => $args['categories_label'], 'class'=>'em-events-search-category'));

to this:

$Myargs = array(
	'selected_cats' => $args['category'],
	'taxonomy' => EM_TAXONOMY_CATEGORY
		 );
wp_terms_checklist( 0, $Myargs);

the tickboxes show up but clicking “Submit” does not take the selection into account.

thanks in advance,
Abdel

https://www.ads-software.com/plugins/events-manager/