Feauture request: 'isolate' property for all container elems

For example, ‘window’ and ‘scrollviewer’ don’t contains ‘isolate’ property.

You can create a new UI by using the existing widgets and IdSpace mixin, as as quick workaround

http://webix.com/snippet/1f6964e0

But ‘isolate’ is inner feauture of webix without any documentation how it works.