E_OPEN_CONTROL_SUB_DIR_OPEN { 
  @send VFCloseTrigger::MSG_GEN_SET_NOT_USABLE( VUM_DELAYED_VIA_APP_QUEUE );
}

@method MyFileOpenControlClass, MSG_FILE_OPEN_CONTROL_SUB_DIR_CLOSE {
  @send VFCloseTrigger::MSG_GEN_SET_USABLE( VUM_DELAYED_VIA_APP_QUEUE );
}

</PRE>

<HR>
<A NAME="FSLib.htm"></A>
<H2 CLASS="sectionTitle">
<A HREF="#index.htm">Viewer-Compatible Documents</A>: 2
VILFile Library</H2>

<P>Each viewer-compatible document type needs a VILFile library responsible 
   for reading, writing, and display