ConnectionService connService = this.diagramPart.service(ConnectionService.class);
DiagramConnectionPart connection = connService.connect(this.source.getModelPart(), this.target.getModelPart(),
this.connDef.getId().content());
// activate direct editing after object creation
if (connection != null && connection.canEditLabel())
{
diagramPart.selectAndDirectEdit(connection);
}
}