Inheritance: MSBuildPropertySet
		public MSBuildPropertySet GetGlobalPropertyGroup ()
		{
			MSBuildPropertyGroupMerged res = new MSBuildPropertyGroupMerged ();
			foreach (MSBuildPropertyGroup grp in PropertyGroups) {
				if (grp.Condition.Length == 0)
					res.Add (grp);
			}
			return res.GroupCount > 0 ? res : null;
		}
        public MSBuildPropertySet GetGlobalPropertyGroup()
        {
            MSBuildPropertyGroupMerged res = new MSBuildPropertyGroupMerged();

            foreach (MSBuildPropertyGroup grp in PropertyGroups)
            {
                if (grp.Condition.Length == 0)
                {
                    res.Add(grp);
                }
            }
            return(res.GroupCount > 0 ? res : null);
        }