* Tree view multi-pane layout now functions properly
* Optimized TV multi-pane layout to draw and hit-test nodes much faster preventing slow-downs with many nodes (tested up to 20,000)

* Fixed error (happening sometimes) when cloning a scene node
* Cloned scene nodes preserve object reference even if its not visible at time of cloning
+ Added default view background color option to change all ZK view backgrounds

* Treeview pane layout is now persisted with the scene

Marsel Khadiyev (Software Developer, EPHERE Inc.)