}

  QString fileName;

  if ( fd->exec() == QDialog::Accepted ) {

    fileName = fd->selectedFile();

    if (working_dir) {

      delete working_dir;

    }

    working_dir = fd->dir();

    if (readStateXML((const char *)fileName,fd->readGeometryP(), fd->readParametersP()) )

      return readStateXML(); // user can try again

  }

}

void Main::clear()

{

  editor->clear();

}

void Main::about()

{

  static QMessageBox* about = new QMessageBox

       <p>\

         An Open Source framework for cell-based modeling of plant\

         tissue growth and development.\

       </p>\

       <p>(c) 2005-2008, Roeland Merks <i>et al.</i>\

         <a href=\"http://www.psb.vib-ugent.be\">VIB Department Plant Systems Biology</a>,\

         Ghent, Belgium.\

       </p>\

         <a href=\"http://www.cwi.nl/~merks\">Roeland Merks <i>et al.</i></a>\

         <a href=\"http://www.cwi.nl\">Centrum Wiskunde & Informatica (CWI)</a> and\

         <a href=\"http://www.ncsb.nl\"> Netherlands Consortium for Systems Biology (NCSB)</a>,\

         Amsterdam, the Netherlands.\

       </p>\

       <p>\

         VirtualLeaf is free software: you can redistribute it and/or\

         modify it under the terms of the GNU General Public License as\

         published by the Free Software Foundation, either version 3 of the\

         License, or (at your option) any later version.\

       </p>\

       <p>\

         If you use this code for your projects, please cite our paper in\

         <a href=\"http://www.plantphysiol.org\">Plant Physiology</a>, &lsquo;\

         Roeland M. H. Merks, Michael Guravage, Dirk Inzé, and Gerrit T.S. Beemster,\

         <a href=\"http://www.plantphysiol.org/cgi/reprint/155/2/656.pdf\">\

         VirtualLeaf: an Open Source framework for cell-based modeling of plant tissue growth and development</a>,<br>\

         Plant Physiology 2011: 155:656-666.\

       </p>\

       <p>\

         Please share your model plugins and extensions at\

         <a href=\"http://virtualleaf.googlecode.com\">http://virtualleaf.googlecode.com</a>.\

       </p>",

      QMessageBox::Information, 1, 0, 0, this, 0, FALSE );