[Overview][Constants][Types][Classes][Procedures and functions][Variables] | Reference for unit 'Classes' (#fcl)

# TBasicAction.OnChange

Occurs when one of the action's properties changes.

## Declaration

`protected property TBasicAction.OnChange: TNotifyEvent read FOnChange write FOnChange;`

## Description

OnChange is the event that is triggered when one of the action's properties changes. This event should be used by client controls or descendent classes to respond to these changes in the properties of the action.

Application programmers should never use the OnChange event directly.