/**
     * @return void
     */
    private function print_add_button()
    {
        $button_id = $this->data->get_button_id();
        $button_attributes = array('id' => "submit-{$button_id}");
        if (!$this->data->has_menu()) {
            $button_attributes['disabled'] = 'disabled';
        }
        ?>

		<span class="add-to-menu">
				<?php 
        submit_button(esc_attr__('Add to Menu', 'multilingualpress'), 'button-secondary submit-add-to-menu right', "add-{$button_id}-item", FALSE, $button_attributes);
        ?>
			<span class="spinner"></span>
		</span>
		<?php 
    }