contains a string encapsulating the new style. Must be evaluated: new_style=value EventData;
Description:
Should be used if you wish to perform an action when ever the Style of a toolbar is adjusted. For example, this would be a useful event if you want to display more items on the toolbar when it is in icon-only mode; each item takes less space on the bar.
Return value:
This event can close the application by returning MSG_APPLICATION_QUIT. Any other return value will be ignored.