private List<PropertyNode> findTags(ClassNode classNode) {
    List<PropertyNode> tags = new ArrayList<PropertyNode>();
    List<PropertyNode> properties = classNode.getProperties();
    List<PropertyNode> potentialAliases = new ArrayList<PropertyNode>();
    for (PropertyNode property : properties) {
      if (property.isPublic()) {
        Expression initialExpression = property.getInitialExpression();
        if (initialExpression instanceof ClosureExpression) {
          ClosureExpression ce = (ClosureExpression) initialExpression;
          Parameter[] parameters = ce.getParameters();

          if (parameters.length <= 2) {
            tags.add(property);
            // force Closure type for DefaultGrailsTagLibClass
            property.setType(CLOSURE_CLASS_NODE);
          }
        } else if (initialExpression instanceof VariableExpression) {
          potentialAliases.add(property);
        }
      }
    }

    for (PropertyNode potentialAlias : potentialAliases) {
      VariableExpression pe = (VariableExpression) potentialAlias.getInitialExpression();

      String propertyName = pe.getName();
      PropertyNode property = classNode.getProperty(propertyName);
      if (property != null && tags.contains(property)) {
        potentialAlias.setType(CLOSURE_CLASS_NODE);
        tags.add(potentialAlias);
      }
    }
    return tags;
  }