{
// removeValignmentSequences(alignment, docseqs);
docseqs.removeAllElements();
{
// removeValignmentSequences(alignment, docseqs);
docseqs.removeAllElements();
// unbind alignment from view.
// create new binding and new alignment.
// mark trail on new alignment as being derived from old ?
// unbind alignment from view.
// create new binding and new alignment.
// mark trail on new alignment as being derived from old ?