NGTreeNodeSelectedImageIndex Property

Returns an image index (for the selected node), or -1 if no image is set. The default implementation here returns -1, but this can be overriden in a derived class. Note that when using SelectedImageIndex, you probably also need to override [M:OnPropertyChanged], so that when the [P:IsSelected] property changed, you must also call [M:OnPropertyChanged] with "ImageIndex" as argument.

public virtual int SelectedImageIndex { get; set; }