Moved open/close/toggle of nodes to separate methods and added support for selection highlighting.
Moved open/close/toggle of nodes to separate methods and added support for selection highlighting.

amekkawi/diskusagereports,maliciamrg/diskusagereports,maliciamrg/diskusagereports,amekkawi/diskusagereports,amekkawi/diskusagereports,maliciamrg/diskusagereports,maliciamrg/diskusagereports