Refresh Explorer Node Tree

http://wiki.netbeans.org/DevFaqAddingRemovingChildrenDynamically

https://layerxml.wordpress.com/2010/10/14/refresh-node-children-automatically/



https://dzone.com/articles/nb-dynamic-icons-for-explorer-trees
https://stackoverflow.com/questions/29841214/netbeans-nodes-api-delete-node-from-explorer
https://blogs.oracle.com/geertjan/no-expansion-icon-when-no-children-part-1