Added the overridable root node functions, which allow the user to switch rendering trees easily for multiple concurrent scenes.
Added the overridable root node functions, which allow the user to switch rendering trees easily for multiple concurrent scenes.


git-svn-id: 53f2a8ff3606f182ef4420064c1f4a5cdcbe6bb1@435 bb9bf1cf-960d-0410-9a3a-baeba60cf407

mono-soc-2011/axiom,mono-soc-2011/axiom,mono-soc-2011/axiom