From: "R. Mark Volkmann" <mark@...>
Date: 2004-12-05T07:13:30+09:00
Subject: get TkCanvas from an item?

If I have a Tk item like a TkcRectangle that has been created on a TkCanvas, 
is there a way to ask the TkcRectangle for the TkCanvas that it is on? For 
example, can I do something similar to this?

root = TkRoot.new {title 'Diagram'}
canvas = TkCanvas.new(root)
item = TkcRectangle.new(canvas, x, y, x + width, y + height)

the_canvas = item.canvas # not a real method

or

the_canvas = item.parent # not a real method