gtk-sharp 0.0.0.0 Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details. A delegate for methods that handle tree cell data. Methods with this shape are used to specify how to fill in tree data; see for example for one place where this class is used as a parameter. System.Delegate System.ICloneable System.Runtime.Serialization.ISerializable System.Void