onDropDown callback

Topic: `APLX Help` : `System Classes` : `Callbacks` : `onDropDown` [ Previous \| Next \| Contents \| Index \| APL Home ]
	The 'onDropDown' callback
This is a synonym for the `onPopUp` callback property.
Topic: `APLX Help` : `System Classes` : `Callbacks` : `onDropDown` [ Previous \| Next \| Contents \| Index \| APL Home ]

The 'onDropDown' callback