I've lifted this from a project I'm working on, thought it might be interesting starting point for some sort of dynamic switching of styles with Alloy.
It's a hack, so please free to rip it apart.
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Add the function to alloy.js
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Add objects for "portrait" and "landscape" to your TSS (and leave defaults in there to be overridden, see the sample)
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Call the function from your controller to a) init the view in case you have the device held in landscape when a window opens and b) within an event listener (remember to kill it)