Publisher modifications - switchModule

trying to add a TAB to the publisher menu, managed to add the TAB but how do we activate the actual page.

added :

In file layout.cfg.xml we added a new menu entry :

<menuEntry id="IDS_TEST" labelKey="BP.modules.test.DBT" tooltipKey="BP.modules.test.DBT">

<jsEvent name="onclick" value="switchModule('IDS_IT_TEST');" />

</menuEntry>

what does the function switchModule do , and what does the Label  'IDS_IT_TEST' mean? what must we to do to navigate to a new page?

thanks,

Tamar KN.