Security plugin and layer problems

["Luc Cessieux" <cessieux hotmail com>]

Hello,
I would like to do a plug-in to DIA:
SISSI (Shématisation informelle de la sécurité d'un système d'information).
I made this plug-in to VISIO and i would like to translate to DIA.
Object is: to draw the information system security.

But i would like to link 2 objects in 2 differents layers with line tool.
An would like associate in object properties the layer.

How i can make a plug-in with Python?

Thank

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