RegionTreeNode regionNode = new RegionTreeNode(region);
regionNode.NodeFont = new Font("Microsoft Sans Serif", 8.25f, FontStyle.Bold);

public class RegionTreeNode : TreeNode
    {
        readonly CountryRegion _countryRegion = new CountryRegion();
        public CountryRegion CountryRegion
        {
            get { return _countryRegion; }
        }
        public RegionTreeNode(CountryRegion countryRegion) : base(string.Format("{0} [{1}]", countryRegion.Name, countryRegion.AssentCount))
        {
            this._countryRegion = countryRegion;
        }
    }