ssociated operation,
a command called when drop occurs, and a command when an object is dragged over the widget.
A drop site must have at least one type of acceptable object and a drop command.

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<HR WIDTH="50%"><BR>
<B><A NAME="wc">COMMAND</A></B><BR>
<DL><DT><A NAME="include">DropSite::<B>include</B></A>
 <I>class</I>
 <I>types</I>
</DT><DD>

This command provides a simple way to include options relatives to a drop site into
BWidget resources definition.
It includes the options needed for <B>register<