void AddRuleSet(WebDom.CssRuleSet ruleset)
        {
            List<CssRuleSetGroup> relatedRuleSets = new List<CssRuleSetGroup>();
            ExpandSelector(relatedRuleSets, ruleset.GetSelector());
            CssPropertyAssignmentCollection assignmentCollection = new CssPropertyAssignmentCollection(null);
            assignmentCollection.LoadRuleSet(ruleset);
            foreach (var ruleSetGroup in relatedRuleSets)
            {
                //start with share*** rule set

                ruleSetGroup.AddRuleSet(assignmentCollection);
            }
        }