public void appendSubVariables(Lock aLock,Variable el)
 {
     __setDirty(true);
       el.__setDirty(true);
       allSubVariables().Add(el);
       acceptor.connectSon (this, el);
     NotifyControllers(aLock);
 }
 /// <summary>Part of the list interface for Variables</summary>
 /// <param name="el">a Variable to add to the collection in 
 ///           Variables</param>
 /// <seealso cref="appendVariables(System.Collections.IList)"/>
 public void appendVariables(Variable el)
 {
     __setDirty(true);
       el.__setDirty(true);
       allVariables().Add(el);
       acceptor.connectSon (this, el);
     NotifyControllers(null);
 }