For TkCanvas#create method, it returns "1" seems useless ...
( Does "1" means successful ? )

To fit in "Ruby" world, it would be better TkCanvas#create returns self.

So you can write something like:
TkCanvas.new.pack.create(TkcRectangle, 0, 0, 5, 5).create(TkcOvale,
50, 50, 70, 70)

Currently, you cannot, the TkCanvas#create returns Fixnum 1.

Thank you.