/**
* Get the new ChartType from the combo box and change
* the GUI to match.
*/
protected void chartTypeChanged(){
ChartTyp typ = (ChartTyp)chartType.getSelectedItem();
handler = ChartFactory.getHandler(typ);
this.remove(cPanel);
cPanel=handler.getChart();
this.add(cPanel,new GridBagConstraints(0, 4, 2, 1, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(2,2,2,2), 1, 1));