i want to dock (group) two Figures/Editparts, so that:
* their models get connected somehow
* their contraints (size/position) are changend synchronous
(proportional/by difference)
There is no such parent<>child relationship between the model elements
as with 'AbstractEditPart.getModelChildren()'. They are more or less
considered to be on a equal level, so it would be more like
<EditPart>.getDockedElements().
Where would be the best starting point for the dockable/docking part?
Specialize AbstractGraphicalEditPart? Or even deeper?