theme function not available, not called?
From the looks of it you've forgotten to register your theme function with the system using hook_theme()

function MYMODULE_theme($existing, $type, $theme, $path) {
  return array(
    'cmis_browser_content_propertiesnewtest' =&gt; array(
      'variables' =&gt; array('cmis_object' =&gt; NULL)
    )
  );
}


After you clear the caches your theme function should be registered with the system and start working as expected.