Nested block works great for managing screen widgets

Exactly what we want, nest the widgets, select the nesting structure from a pattern.  You see some graph patterns, icons,on your IDE, like seeing block patterns  on your blog design tool.  Then, screen changes become enclose operations, prepend this nest block of widgets  into the structure of some sub graph in the layout.  let's you create a whole set [of configuration contexts for some part of the  screen, say, a separate swatch window functionality in the debugger, the new nest replacing the previous nest enclose by that panel.