ISelection sel = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getSelection();
		 
EditPart editPart = (IGraphicalEditPart
                    ((IStructuredSelection)sel).getFirstElement();

//MyStakeholder is a node/figure which is assumed to be selected here, just for testing purposes.
if(editPart instanceof MyStakeholder)
{
    final MyStakeholder test2 = (MyStakeholder) ((GraphicalEditPart)        editPart).resolveSemanticElement();

   System.out.println(test2.getName());
   System.out.println(test2.getQuantity());
   System.out.println(test2.getXXX());
   //.. and so on..
}