setting vars on page load

[Patrick Kelly]

I have been playing around with pageBeginRender to set some vars when 
the page first loads.  The problem is that I have a form with a submit 
and I don't want the vars to be set again, but pageBeginRender is always 
called when the form is submitted.  Is there a way to know when the page 
is first loaded, and to be able to set some vars during that action?  I 
am currently using Tapestry 3.

Thanks - Patrick
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