Bug 97810 [preferences] Code template preference page buttons are not grayed out if invoked as project specific property page
3.1 RC1 Steps to reproduce: - Invoke Override Method on a project with no project-specific settings - Follow link to code template preference page -> Edit, Import, ... buttons are disabled, but not grayed out -> Toggling 'Enable project specific settings twice correctly grays out the buttons
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/dialogfields/TreeListDialogField.java
}
				boolean isExpanded= fTree.getExpandedState(oldElement);
				fTree.remove(oldElement);
				fTree.add(fParentElement, newElement);
				if (isExpanded) {
					fTree.expandToLevel(newElement, fTreeExpandLevel);
				}
				selectElements(new StructuredSelection(selected));
			}
			dialogFieldChanged();
		} else {
			throw new IllegalArgumentException();
		}
	}
	/**
	* Adds an element at the end of the tree list.
	*/
	public void addElement(Object element) {
		if (fElements.contains(element)) {
			return;
		}
		fElements.add(element);
		if (isOkToUse(fTreeControl)) {
			fTree.add(fParentElement, element);
			fTree.expandToLevel(element, fTreeExpandLevel);
		}
		dialogFieldChanged();
	}
	/**
	* Adds elements at the end of the tree list.