public List<IItemPropertyDescriptor> getPropertyDescriptors(Object specHierarchy) {
		super.getPropertyDescriptors(specHierarchy);  // populates itemPropertyDescriptors

		// We need to separate the SpecHierarchy's properties from the
		// SpecObject's properties. Therefore, we rename the Category.
		ArrayList<IItemPropertyDescriptor> newDescriptors = new ArrayList<IItemPropertyDescriptor>();
		for (IItemPropertyDescriptor descriptor : itemPropertyDescriptors) {
			newDescriptors.add(new ItemPropertyDescriptorDecorator(
					specHierarchy, descriptor) {
				public String getCategory(Object thisObject) {
					return getString("_UI_SpecHierarchyPropertyCategory");
				}
			});
		}

                // Replace the old descriptors
		itemPropertyDescriptors = newDescriptors;

		SpecObject specObject = ((SpecHierarchy) specHierarchy).getObject();
		if (specObject != null) {
                        // Add the SpecObject's property descriptors
			ItemProviderAdapter specObjectItemProvider = ProrUtil
					.getItemProvider(adapterFactory, specObject);
			itemPropertyDescriptors.addAll(specObjectItemProvider
					.getPropertyDescriptors(specObject));
		}
		return itemPropertyDescriptors;
	}