How to connect Canvas object by line ?

I want to make an application which can draw object
relationship like UML. for example , after i made the replationship
between two object (draw line), when i drag one object , the line
will be updated automatically .And when i select the connect line ,
this line object will be selected also .
It seems that ,the Grpahic's drawline method is not the
correct choice , how can i do for that ? Make a new control ?
I use the Canvas container as the drawing area.
thanks for your reply.

or , How can i use the MouseEvent to get the draw line ?
What is the object type of a draw line ?

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Hi,
these threads can help you
http://forum.java.sun.com/thread.jspa?threadID=488823&messageID=2292924
http://forum.java.sun.com/thread.jspa?forumID=20&threadID=607264
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How to connect Canvas object by line ?

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