private void FindAllCheckedFavorites(List<IFavorite> favorites)
{
var candidates = this.FindCheckedFavorites();
favorites.AddRange(candidates);
foreach (GroupTreeNode groupNode in this.GroupNodes)
{
// dont expect only Favorite nodes, because of group nodes on the same level
groupNode.ExpandCheckedGroupNode();
var childNodes = new TreeListNodes(groupNode.Nodes);
childNodes.FindAllCheckedFavorites(favorites);
}
}
