Widget — define a new widget instance
Script — associate code with a widget
BindEvent — associate code with an event
InvokeMethod — make a method call on a widget
WidgetReference — find an existing widget instance
SetWidgetReference — add a widget to the widget registry
UnsetWidgetReference — remove a widget from the widget registry
PropertyValue — get a widget property value
SetPropertyValue — set a widget property value
$GUIPath — list the directories to search for interface files
