sg.addSequence(af.getViewport().getAlignment().getSequenceAt(1), false);
sg.addSequence(af.getViewport().getAlignment().getSequenceAt(2), true);
af.alignPanel.alignmentChanged();
sg.addSequence(af.getViewport().getAlignment().getSequenceAt(1), false);
sg.addSequence(af.getViewport().getAlignment().getSequenceAt(2), true);
af.alignPanel.alignmentChanged();