First of all, this is not WordPress-specific, and does therefore not belong in WordPress.StackExchange. As it’s so easy to answer, however…
include is not a function, but it does return whatever you put in “return” inside the file that’s included. You can use an output buffer to “catch” all output:
ob_start();
include TEMPLATEPATH . '/apex.php';
$html .= ob_get_clean();
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