Constructs an editor reactor object that notifies of a change to the bitmaps in a toolbar

(vlr-toolbar-reactor data callbacks)



Any AutoLISP data to be associated with the reactor object; otherwise nil if no data.


A list of pairs of the following form:

(event-name . callback_function)

where event-name is one of the symbols listed in the “Toolbar reactor events” table below, and callback_function is a symbol representing a function to be called when the event fires. Each callback function accepts two arguments:

reactor_object The VLR object that called the callback function.

list A list of extra data elements associated with the particular event. The contents of this list for particular events are shown in the “Toolbar reactor callback data” table.

Return Values

The reactor_object argument.

Toolbar reactor events

Event name



The size of the AutoCAD toolbar icons is about to change.


The size of the AutoCAD toolbar icons has changed.

Toolbar reactor callback data


List length





T, if the toolbar is being set to large bitmaps; nil if the toolbar is being set to small bitmaps.