[Zope] manage_editProperties in ZClasses

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hi all,
how do i change the default value of textarea (cols) from 35 to something else?
 i edited Property.py in lib/python/ZClasses, changing  line 199
 -- <textarea name="%s:text" rows="6" cols="75"><dtml-var %s
            ></textarea>'''  
saved it, restart zope and tried changing my ZClass property.  biut i still got
the cols=35.  what did i miss?

tia
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