#concrete5 #DesignerContentPro Manual Nav block made with Designer Content Pro ("Combo" Link field, additional option field)

view.php

<?php defined('C5_EXECUTE') or die(_("Access Denied.")); ?>
<?php /* This block was made with Designer Content Pro. Visit http://theblockery.com/dcp for documentation. */ ?>

<?php
/**
 * link: Link Field
 * css_class: Textbox field
 */

// Get current page path
$current_path = Page::getCurrentPage()->getCollectionPath();

// Get repeating items
$items = $controller->getRepeatingItems();

// Check if items exist
if (count($items) > 0) : ?>
<nav class="dcp-manual-nav" role="navigation">
	<ul>
		<?php foreach ($items as $item):
		// Get field values
		$title = $item->link->getText();
		$url = $item->link->getHref();
		
		// Determine CSS classes
		$classes = array();
		
		// Check if the link is c5 Page
		if ($item->link->isPageLink()){
			$page = $item->link->getPageObj(); // to get page object, you need DCP 1.2+
			
			$target = ($page->getCollectionPointerExternalLink() != '' && $page->openCollectionPointerExternalLinkInNewWindow()) ? '_blank' : $page->getAttribute('nav_target');
			$target = empty($target) ? '_self' : $target;
			
			// get the nav menu item's path (for comparison to the current page path)
			$item_path = $item->link->getPageObj()->getCollectionPath();
			
			if ($item_path == $current_path) {
				// class for the page currently being viewed
				$classes[] = 'nav-selected';
			}
			
			if (!empty($item_path) && (strpos($current_path, $item_path) === 0)) {
				// class for parent items of the page currently being viewed (except the home page)
				$classes[] = 'nav-path-selected';
			}                  
			
		} else {
			// the link is external link
			$target = '_blank';
		}
		
		if ($item->css_class->getText()) {
			// class from the item field
			$classes[] = $item->css_class->getText();
		}
		
		// Put all classes together into one space-separated string
		$class = implode(" ", $classes);
		?>
		<li><a href="<?php echo $url?>" class="<?php echo $class?>" target="<?php echo $target?>"><?php echo $title?></a></li>
		<?php endforeach; ?>
	</ul>
</nav>
<?php endif;

Updated to simplify version. Thanks Jordan!
http://www.concrete5.org/marketplace/addons/designer-content-pro/forums/view-template-example-manual-nav-with-combo-link-field/