I can't fire event when clicking on tab page in MS Access 2007

I have a click_event handler on a Tab page 开发者_JS百科but when I click on it, nothing occurs and with debug I can see it is never triggered.

Is this a bug ?

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When code starts misbehaving, it is often worth trying decompile.

http://www.granite.ab.ca/access/decompile.htm