private void checkEnableButtons()	{
		
		//System.out.println("btnEnlever : " + lTeach.getSelectedIndex() + " " + lGroup.getSelectedIndex() + " " + lField.getSelectedIndex());
		btnEnlever.setEnabled(lTeach.getSelectedIndex() != -1 && lGroup.getSelectedIndex() != -1 && lField.getSelectedIndex() != -1);
		
		//System.out.println("btnEditer : " + listTeach.getSelectedValue() + " " + listGroup.getSelectedValue() + " " + listField.getSelectedValue());
		btnEditer.setEnabled(lTeach.getSelectedIndex() != -1 && lGroup.getSelectedIndex() != -1 && lField.getSelectedIndex() != -1 && (listTeach.getSelectedValue() != lTeach.getSelectedValue() || listGroup.getSelectedValue() != lGroup.getSelectedValue() || listField.getSelectedValue() != lField.getSelectedValue()));
		
		//System.out.println("btnAjouter");
		btnAjouter.setEnabled(listTeach.getSelectedIndex() != -1 && listGroup.getSelectedIndex() != -1 && listField.getSelectedIndex() != -1);
	}