internal IssueTreeNode(IssueManager.IssueProvider provider, Action checkedChanged)
 {
     this.Provider         = provider;
     this.attribute        = provider.Attribute;
     this.checkedChanged   = checkedChanged;
     this.PropertyChanged += OnPropertyChanged;
 }
 internal IssueOptionsViewModel(IssueManager.IssueProvider provider)
 {
     this.Provider  = provider;
     this.attribute = provider.Attribute;
     this.Severity  = attribute.Severity;
 }