Hide button bug, feature or doing it the wrong way ??

Hi All,
I'm trying to hide a button via a dynamic action. I've changed the template to include the button attrributes and given the button an ID to reference this in my dynamic action ( DOM Object name = button id ) and also applied this template to the button.
This always seems to work fine until :
If I have a button with position "top and bottom of the region" and in the dynamic action this is the only Dom object which I reference in the hide action.
When I do this only 1 instance of the button gets hidden, the one on the bottom of the region is still shown....
I am able to bypass this by adding another dummy DOM object name to the line of reference Dom objects in the dynamic action ( so the DOM object which is hidden is reference as "button_id,dumm" ), the dummy does not exist but adding this string to the line seems to fix it.
Am I missing something or is this a bug ?
Ciao
Bas
btw this is apex 4.02

When you choose the display position as "top and bottom" , there are two button elements rendered with same properties(that you specify for the button properties.)
If you have two page elements with the same ID(which is a bad practice anyway) ,accessing the DOM using the ID directly will pick only one of them(the first found in DOM, I think) , this is the same behaviour with $x , document.getElementById or jQuery $('#..) methods too and is nothing special about apex.
You can either change the selector to jQuery and jQuery selctor as
[id="button id"]The proper way would be to give it a name attribute or a class property using the "button attributes" field and use an appropriate selector.

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