I have the following line in a page template jsp, for which I want to hide the AdminCentral button on mainBar:

<cms:mainBar paragraph="somePrefixPageProperties" adminButtonVisible="false" />

But, when the page is opened, the 'AdminCentral' button is still visible on the page.

I tried the following:
setting it to "true", did not change anything.
setting it to "xyz", causes no change and no error.
setting ABCadminButtonVisible="false", causes the following error:
Attribute ABCadminButtonVisible invalid for tag mainBar according to TLD

(so, tld is validating it correctly, but something may be happening in setAdminButtonVisible method and after...)

My current setup:
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Magnolia version: Magnolia 2.1.5
OS/Hardware: Sun OS 5.8

If I've understood the use of this attribute wrong, please advise.

Thanks
M Rather