Adding nodes and connectors

["Tang Wai-kwok" <wktang hotmail com>]

Hi, I want to draw a line to link up 2 buttons. As I understand, I may need 
to add a node in each of the 2 buttons and then a "connector" (which is 
actually a line) to link up the 2 nodes. Can someone tell me how to add 
"nodes" and "connectors"?
Also, do these nodes and connectors have to be added on a canvas? That may 
be a problem cos my buttons are not on the canvas. Does it mean I have to 
somehow put the buttons on a canvas? and if so, how should I go about do it?
Thank you for your attention!
William

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