* <code>edgeFile_</code>. Must be one of checkbox data set listeners.
*/
private void loadDataset() {
Parser.removeAllEdges(dataSet_);
Parser.removeAllVertices(dataSet_);
Dictionary d = null;
try {
if (docBase_ != null) {
d = Parser.parseVertices(new URL(docBase_.toString() + vertexFile_), dataSet_);
} else {
d = Parser.parseVertices(vertexFile_, dataSet_);