public SubTreeRootDependencyNode(string providerType,
string caption,
ProjectTreeFlags flags,
ImageMoniker icon,
ImageMoniker?expandedIcon = null,
int priority = 0)
: base(new DependencyNodeId(providerType, string.Empty, string.Empty),
flags, priority, null, resolved: true)
{
Requires.NotNullOrEmpty(caption, nameof(caption));
Caption = caption;
Icon = icon;
ExpandedIcon = expandedIcon ?? Icon;
Flags = flags.Add(SubTreeRootNodeFlags.ToString());
}