the tree structures and functions. UI gadgetry can dynamically be added, moved, or removed.</LI>
</UL>
<P>
Each of the different generic classes is described in overview depth below. Note that every one of these classes may be subclassed to add, change, or remove functionality. Changing or removing functions from a generic class is not encouraged, however, as it can cause a specific UI library to give unpredictable results. </P>

<H2 CLASS="HeadingC">
GenClass</H2>
<P>
<A NAME="IX_GenClass">
 </A>
<CODE>
Ge