mainbox.add(centralpanel);
mainbox.add(Box.createVerticalStrut(15));
mainbox.add(warningpanl);
mainbox.add(Box.createVerticalStrut(15));
/** Listener on trasformation per change label **/
model.addOnChangeVariableValue(new ChangeVariableListener() {
public void onChangeVariableValues() {
if (varsList.getSelectedIndex() >= 0) {
switch (model.getMatrix().getVariables()[varsList.getSelectedIndex()].getType()) {
case STRING:
varLabel.setText(HTML_START + HTML_FONT_NORM + "This is a String variable and it has been transformed has "