[BUG]: af:commandButton rendered with requestScope variable doesn't work

This took me two days to figure out, and I wonder if it is a bug:
I have a page that can be navigated to on two occassions, let's call them "left" and "right". I want the page to know what side I came from, so I set a requestScope variable on the buttons that navigate to this page, a bit like this:
<af:commandButton action="toPage">
<af:setActionListener from="left" to="#{requestScope.sideFrom}"/>
</af:commandButton>I have two buttons on the page, one is to navigate back to the left and one to navigate back to the right. Only one is rendered, depending on the requestScope.sideFrom variable.
One says rendered="#{requestScope.sideFrom eq 'left'}" and the other says rendered="#{!requestScope.sideFrom eq 'left'}"
Only one button works, namely the one for which the rendered property evaluates to true <b>when the button is pressed</b>!! My requestScoped variable doesn't exist anymore when I press the button to navigate back so it's behavior is changed. How weird is that?
Should I file a bug?
I refuse to make it a sessionScoped variable and change it back with the return buttons Imho this is what requestScope is for.
I am on JDeveloper 11.1.1.6

Wendy,
To amplify what Timo rightly says: as JSF goes through its merry lifecycle, one of the steps is to rebuild the component tree in memory. When you use the rendered property, that particular component is not in the component tree - it's as if it doesn't even exist according to JSF. Then, when it comes time to deal with events, the event isn't seen or is ignored (I don't know which) because JSF doesn't think that component is present. As Timo also rightly says - this behaviour is why the "visible" attribute was created.
John

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[BUG]: af:commandButton rendered with requestScope variable doesn't work

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