Robert asked if you have a @Persist on your CollageModel in the parent
component or page. Parameters in Tapestry have a bi-directional binding. So,
if you have a @Persist on the model it is shared in the session. Two browser
tabs/windows also share the same session.
If you want to have state per window you have to either store that on the
client side or implement a sub-session per window.
We're currently working on a @Persist("window") and @WindowState here
https://github.com/porscheinformatik/tapestry-conversation - but it's just a
work in progress.
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