In the barebones clim app below, using the "Resize Input" command to resize the interactor pane causes the scrollbar thumb to resize so that the new bigger interactor can be scrolled around. This is what I'd expect. Resizing the application pane in similar fashion ("Resize Output") however, has no effect that I can see. I've only been using clim for a few days, so it's not obvious to me that it's supposed to work like this anyway. If it isn't, please feel free to say so. How should I be doing this? (The name of this application is because I initially suspected from TRACEing COMPOSE-SPACE that there was a vrack pane swallowing the space requirement and substituting its own. Now, though, I just believe I don't understand the layout protocol anyway) (clim:define-application-frame vrack-test () () (:pointer-documentation t) (:panes (track :application :scroll-bars :vertical ;:width 600 :height 400 ) (int :interactor :height 120 :width 600)) (:layouts (default (vertically () track int)))) (define-vrack-test-command (com-quit :name "Quit") () (frame-exit *application-frame*)) (define-vrack-test-command (com-resize-out :name "Resize Output") ((size 'number)) (change-space-requirements *standard-output* :width 600 :height size)) (define-vrack-test-command (com-resize-in :name "Resize Input") ((size 'number)) (change-space-requirements *standard-input* :width 600 :height size))) (run-frame-top-level (make-application-frame 'vrack-test)) -- "please make sure that the person is your friend before you confirm"