* @param childDivElementID the element ID for the children block of the node whose display is to be controlled by the toggle.
* @param isPlaceholderOnly whether this is to be an inactive placeholder for a toggle.
*/
private void generateModuleListTreeNodeToggle(final String childDivElementID, boolean isPlaceholderOnly) {
final AttributeList attributes;
final String toggleText;
if (isPlaceholderOnly) {
attributes = classAttribute(StyleClassConstants.TREE_NODE_TOGGLE_PLACEHOLDER);
toggleText = " ";