avior for handling input messages such as <CODE>MSG_META_START_SELECT</CODE>
, <CODE>
MSG_META_END_SELECT</CODE>
, and <CODE>
MSG_META_PTR</CODE>
. For the most part, however, visible objects that want to respond to input must subclass and handle the input messages that interest them.</P>
<P>
Composite objects will automatically pass mouse messages on to the proper child directly under the mouse pointer. Non-composite objects (direct subclasses of <CODE>
VisClass</CODE>
) have no special default behavior fo