Word capitalising for listing Title

Hi!

I have this snippet that works well for capitalising the listing title in case the user didn’t bother to use capital letters:

add_filter('wp_insert_post_data','_capitalise_title_func',10);
function _capitalise_title_func($data){
	if(isset($data['post_type']) && function_exists('geodir_get_posttypes') && in_array($data['post_type'],geodir_get_posttypes()) && isset($data['post_title'])){
		$data['post_title'] = ucwords( $data['post_title'] );
	}
	return $data;
}

Could you please be kind enough to help me adjusting it, so the post_title in the plugin’s custom data table is also capitalised? I think it requires the return of $postarr instead of $data, but I am not certain.

Thanks!
Eugene