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

Button Events

Close	Create	DragDrop
Configure	ContextMenu	DropFiles
DropObjects	Expose	Help
KeyPress	GotFocus	LostFocus
MouseDown	MouseUp	MouseMove
MouseDblClick	MouseEnter	MouseLeave
MouseWheel	GestureZoom	GesturePan
GestureRotate	GestureTwoFingerTap	GesturePressAndTap
FontOK	FontCancel	Select
DropDown