How to make ‘pages’ menu expanded

Do you mean you want the Pages mane to show all child pages all of the time? Or are you looking for some sort of folding menu?

I’m looking for a drop down menu on the left side nav
sort of expanding like accordion.
i have the spry asset form DRWVRM

Something like:

<?php
$my_pages = wp_list_pages('title_li=&depth=1&echo=0');
if (is_page()) {
	$this_page = $post->ID;
	if ($post->post_parent) $this_page= $post->post_parent;
	$children = get_page_children($this_page, get_pages());
	if($children) {
		$my_pages .= "<li>\n".'<ul class="subpages">';
		foreach($children as $child) {
			$my_pages .= wp_list_pages('title_li=&include='.$child->ID.'&echo=0');
		}
		$my_pages .= '</ul></li>';
	}
}
echo $my_pages;
?>

in your sidebar template should work.