#4 "_doc" component not working

[Anonymous]

I ve created a model with "_docin" and "_docout" components and save the file as a .jmcad.
On another model, I've included a "_doc" component with file name pointing to the model above.
After I finished editing the component, I've got a Java.lang.NullPointerException.
How can I include a sub-model into my model with JMCAD? Is this feature available?
Thanks in advance
Felipe Trevisan (trevisanfelipe@yahoo.com.br)