private void fillData() {

		for (String s : DataProvider.getRoots()) {
			leftComboBox.addItem(s);
			rightComboBox.addItem(s);
		}
		// frames are auto filled as comboBox value is changed
		leftComboBox.setSelectedIndex(0);
		rightComboBox.setSelectedIndex(1);

		// rightSizeCheckbox.setSelected(true);
		// rightDateCheckbox.setSelected(true);
	}