Dear all:
        I just wonder when I pick several objects say one sphere and one
square, how do I group together.  There two objects could be created
anytime in any order.  I have a vector of object, could i use reference of
that.  
        The other thing is when I try to delete a object from the canvas,
it seems to work by using the Branchgraph.detach() function.  But once I
detach all the object, I can add any more object to the canvas, even
though the counter for the vector still increments.

        Thanks a lot!

Kelan

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