NB: More recent documentation for Dyalog APL is available at https://docs.dyalog.com/20.0/.

Rect Parents

ActiveXControl	Animation	Bitmap
Button	ButtonEdit	Combo
ComboEx	Edit	Form
Grid	Group	Label
List	ListView	MDIClient
Metafile	Printer	ProgressBar
PropertyPage	PropertySheet	RichEdit
Scroll	Spinner	Static
StatusBar	SubForm	TabBar
TipField	ToolBar	TrackBar
TreeView	UpDown