[Notice] In XOOPS Cube Legacy which can have many themes with different render- systems, that one render-system has the control to change themes is wrong, because this action can't list up themes of other render-systems. The action to change themes should be in Legacy. And, each render-systems should send theme informations through delegate-mechanism.
Therefore, this class is test for that we may move this action from LegacyRender module. If you want to check the concept of this strategy, see ThemeSelect preload in Legacy module.
1.5.1