// ce.addEdit( new EditAddSessionObjects( this, group.getTransmitters(), collSO ));
if( b1 ) {
ce.addPerform( new EditAddSessionObjects( this, doc.getMutableGroups(), collGroup ));
}
ce.perform();
ce.end();
doc.getUndoManager().addEdit( ce );
} finally {
doc.bird.releaseShared( Session.DOOR_TRNS | Session.DOOR_RCV );