Adding form code to sidebar.php

I want to add a custom search form within a custom sidebar. For some reason the form code does not show up when I add it to sidebar-custom.php. The form code does show up when I add it to page.php or some other file. It’s probably a simple php thing.

Here is my custom search form, very standard code:

<form id="searchform" action="<?php bloginfo('url'); ?>/" method="get">
<input class="inlineSearch" type="text" name="s" value="Enter a keyword" onblur="if (this.value == '') {this.value = 'Enter a keyword';}" onfocus="if (this.value == 'Enter a keyword') {this.value = '';}" />
<input type="hidden" name="post_type" value="portfolio" />
<input class="inlineSubmit" id="searchsubmit" type="submit" alt="Search" value="Search" />
</form>

Here is my sidebar-custom.php, just like regular sidebar stuff:

<?php

if ( is_active_sidebar( 'inv-sb' ) ) : ?>
	<aside id="secondary" class="sidebar-container" role="complementary">
		<div class="sidebar-inner">
			<div class="widget-area">
                           <?php dynamic_sidebar( 'inv-sb' ); ?>
			</div>
		</div>
	</aside><!-- #secondary -->
<?php endif; ?>

I’ve tried adding the form code in a few different spots in the sidebar-custom.php without getting it to work. This doesn’t work:

<?php

if ( is_active_sidebar( 'inv-sb' ) ) : ?>
	<aside id="secondary" class="sidebar-container" role="complementary">
		<div class="sidebar-inner">
			<div class="widget-area">
<form id="searchform" action="<?php bloginfo('url'); ?>/" method="get">
<input class="inlineSearch" type="text" name="s" value="Enter a keyword" onblur="if (this.value == '') {this.value = 'Enter a keyword';}" onfocus="if (this.value == 'Enter a keyword') {this.value = '';}" />
<input type="hidden" name="post_type" value="portfolio" />
<input class="inlineSubmit" id="searchsubmit" type="submit" alt="Search" value="Search" />
</form>
                           <?php dynamic_sidebar( 'inv-sb' ); ?>
			</div>
		</div>
	</aside><!-- #secondary -->
<?php endif; ?>

I want that custom form code to appear within the sidebar-inner div.