Update attribute and method names in ToolBox to reflect encapsulation efforts.

Using ToolBox._xxx instead of ToolBox.__xxx because realistically ToolBox is still much to large to grok and so I imagine it will need to be broken up even more (base class focused on just the panel details perhaps - or mixins - etc...).
Hack to fix bug introduced in 806202d.

I may be trying to juggle to many competing branches working on same component.