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"If the point is within the clickable area of the object, the within
function returns true, even if another object is layered on top of the
object. If the object is a graphic, its interior is considered to be within
the graphic only if the graphic's filled property is true or the graphic is
selected."

So even if you have an unfilled poly you can test 'within' using the
following method:

lock screen
set the filled of grc x to true
put within(grc 1,point) into isItWithin
set the filled of grc x to false

Cheers

Monte