public function meta_box($post, $metabox)
 {
     $connection_name = $metabox['args']['connection'];
     $direction = $metabox['args']['direction'];
     $connection = $this->connection_factory->get_connection($connection_name);
     $connection_args = $connection->get_args();
     $selected = $direction == 'to' ? $connection->get_connected_to_objects($post->ID) : $connection->get_connected_from_objects($post->ID);
     $args = array('post_type' => $direction == 'to' ? $connection->to() : $connection->from(), 'selected' => $selected, 'sortable' => $connection->is_sortable($direction), 'labels' => $connection_args[$direction]['labels'], 'orderby' => $connection_args['metabox']['orderby'], 'order' => $connection_args['metabox']['order'], 'limit' => $connection_args[$direction]['limit']);
     $args = apply_filters("o2o_{$connection_name}_psu_args", $args, $direction);
     echo post_selection_ui($connection_name . '_' . $direction, $args);
     wp_nonce_field('set_' . $connection->get_name() . '_' . $direction . '_' . $post->ID, $connection->get_name() . '_' . $direction . '_nonce');
 }
        /**
         * Render control
         */
        public function render_content()
        {
            $value = explode(',', $this->value());
            $psu_args = array_merge(array('selected' => $value), $this->psu_args);
            ?>
		<label class="voce-customize-psu">
			<span class="customize-control-title"><?php 
            echo esc_html($this->label);
            ?>
</span>
			<?php 
            echo post_selection_ui($this->id, $psu_args);
            ?>
		</label>
		<?php 
        }
    static function display_callback($field, $value, $post_id)
    {
        $args = array_merge(array('id' => $field->get_input_id(), 'selected' => is_array($value) ? $value : explode(',', $value)), (array) $field->args);
        ?>
		<div class="voce-post-meta-psu-container">
			<div class="label">
				<?php 
        voce_field_label_display($field);
        ?>
			</div>
			<div class="form-input">
				<div class="widget">
					<div class="widget-inside" style="display:block; border:0;">
						<?php 
        echo post_selection_ui($field->get_name(), $args);
        echo !empty($args['description']) ? '<br><span class="description">' . $args['description'] . '</span>' : '';
        ?>
					</div>
				</div>
			</div>
		</div>
		<?php 
    }