De/activate multiple scene objects with one click.

Usage example: When a wizard-like GUI dialog is created using UI gameobjects, the problem rises that all pages of the dialog appear at once in editor. To edit a specific page, all others need to be hidden temporarily. Instead of selecting objects for manual deactivation, simply define a ViewStacks group and add all "page" objects once. Use a single click to switch to any page and hide all others automatically.

Works as editor extension primarily, but can also be used in game runtime to implement page swapping functionality.