From Mod Wiki
This class is abstract and may not be used directly in the GUIs. Any classes deriving from this class will inherit all its properties, flags, functions and events.
setParent Sets a new parent for the window. isChild Checks if the window is a child (possibly indirectly a child) of the the window supplied as the first parameter. changeZOrder Change the drawing order for the window. postNamedEvent Post a named event on the window. postOptionalNamedEvent Post a named event on the window. Will not give error if the named event does not exist.
onCreate Called on window creation onNamedEvent Called when one of the events specified occurs onPropertyChanged Called when one of the properties specified occurs onCVarChanged Called when one of the CVars' value changes