/** @return the product name, or null if the base product is selected. */
protected String getSelectedProductName() {
final int index = productDropDown.getSelectionIndex();
if (index <= 0) /* base is at index 0 */ return null;
return productDropDown.getItem(index);
}
protected String getSelectedProjectName() {
return projectDropDown.getItem(projectDropDown.getSelectionIndex());
}