Displaying a template within the header template?

[saajjj]

Hello,
I've made a very simple template (called tmplt_simpleWord) which is just a single word: test
I want to display this template in the header.

In the header template, I've got:

{vb:raw show_simpleWord}

The plug-in is:

PHP Code:

$templater = vB_Template::create('tmplt_simpleWord');
$templateValues['show_simpleWord'] = $templater->render();
vB_Template::preRegister('header', $templateValues); 


I've tried this with the following hooks but none of them does anything to the header:
global_start
process_templates_complete

I've been successful in inserting the same template into FORUMHOME by switching the last line of the plugin from:

PHP Code:

vB_Template::preRegister('header', $templateValues); 


to

PHP Code:

vB_Template::preRegister('FORUMHOME', $templateValues); 


, setting the hook to forumhome_start and adding the same template code to the FORUMHOME template.

What am I doing wrong in trying to insert the template into the header?
Any help appreciated.

Cheers,