diff --git a/basis/ui/tools/browser/browser.factor b/basis/ui/tools/browser/browser.factor
index 4424a9d114..e4b3168bd4 100644
--- a/basis/ui/tools/browser/browser.factor
+++ b/basis/ui/tools/browser/browser.factor
@@ -11,6 +11,8 @@ IN: ui.tools.browser
 
 TUPLE: browser-gadget < track pane scroller search-field ;
 
+TOOL: browser-gadget { 550 400 }
+
 : show-help ( link browser-gadget -- )
     model>> dup add-history
     [ >link ] dip set-model ;
@@ -33,18 +35,13 @@ TUPLE: browser-gadget < track pane scroller search-field ;
         "Search:" <label> add-gadget
         swap search-field>> add-gadget ;
 
-: <help-pane-scroller> ( browser -- scroller )
-    pane>> <limited-scroller>
-        { 550 400 } >>max-dim
-        { 550 400 } >>min-dim ;
-
 : <browser-gadget> ( link -- gadget )
     { 0 1 } browser-gadget new-track
         swap <history> >>model
         dup <search-field> >>search-field
         dup <browser-toolbar> f track-add
         dup <help-pane> >>pane
-        dup <help-pane-scroller> >>scroller
+        dup pane>> <scroller> >>scroller
         dup scroller>> 1 track-add ;
 
 M: browser-gadget graft*
diff --git a/basis/ui/tools/common/common.factor b/basis/ui/tools/common/common.factor
index 29f52eda78..b14d5bc7bb 100644
--- a/basis/ui/tools/common/common.factor
+++ b/basis/ui/tools/common/common.factor
@@ -1,8 +1,29 @@
 ! Copyright (C) 2009 Slava Pestov.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: accessors ui.gadgets.scrollers ;
+USING: accessors assocs classes classes.mixin kernel namespaces
+parser ui.gadgets ui.gadgets.scrollers ;
 IN: ui.tools.common
 
+SYMBOL: tool-dims
+
+tool-dims global [ H{ } clone or ] change-at
+
+MIXIN: tool
+
+M: tool pref-dim*
+    class tool-dims get at ;
+
+M: tool layout*
+    [ call-next-method ]
+    [ [ dim>> ] [ class ] bi tool-dims get set-at ]
+    bi ;
+
+: TOOL:
+    scan-word
+    [ tool add-mixin-instance ]
+    [ scan-object swap tool-dims get set-at ]
+    bi ; parsing
+
 SLOT: scroller
 
 : com-page-up ( tool -- )
diff --git a/basis/ui/tools/inspector/inspector.factor b/basis/ui/tools/inspector/inspector.factor
index 2d531c3d77..37df73664e 100644
--- a/basis/ui/tools/inspector/inspector.factor
+++ b/basis/ui/tools/inspector/inspector.factor
@@ -6,11 +6,14 @@ io io.styles arrays hashtables math.order sorting refs
 ui.tools.browser ui.commands ui.gadgets ui.gadgets.panes
 ui.gadgets.scrollers ui.gadgets.slots ui.gadgets.tracks
 ui.gestures ui.gadgets.buttons ui.gadgets.tables
-ui.gadgets.status-bar ui.gadgets.theme ui.gadgets.labelled ui ;
+ui.gadgets.status-bar ui.gadgets.theme ui.gadgets.labelled
+ui.tools.common ui ;
 IN: ui.tools.inspector
 
 TUPLE: inspector-gadget < track table ;
 
+TOOL: inspector-gadget { 500 300 }
+
 TUPLE: slot-description key key-string value value-string ;
 
 : <slot-description> ( key value -- slot-description )
@@ -75,9 +78,6 @@ M: hashtable make-slot-descriptions
 M: inspector-gadget focusable-child*
     table>> ;
 
-M: inspector-gadget pref-dim*
-    drop { 500 300 } ;
-
 : com-refresh ( inspector -- )
     model>> notify-connections ;
 
diff --git a/basis/ui/tools/listener/listener.factor b/basis/ui/tools/listener/listener.factor
index 5d434ad6ef..147916eab1 100644
--- a/basis/ui/tools/listener/listener.factor
+++ b/basis/ui/tools/listener/listener.factor
@@ -151,6 +151,8 @@ M: interactor dispose drop ;
 
 TUPLE: listener-gadget < track input output scroller popup ;
 
+TOOL: listener-gadget { 550 700 }
+
 : find-listener ( gadget -- listener )
     [ listener-gadget? ] find-parent ;
 
@@ -412,7 +414,4 @@ M: listener-gadget graft*
     [ call-next-method ] [ restart-listener ] bi ;
 
 M: listener-gadget ungraft*
-    [ com-end ] [ call-next-method ] bi ;
-
-M: listener-gadget pref-dim*
-    drop { 550 700 } ;
\ No newline at end of file
+    [ com-end ] [ call-next-method ] bi ;
\ No newline at end of file
diff --git a/basis/ui/tools/profiler/profiler.factor b/basis/ui/tools/profiler/profiler.factor
index c37f0bd8b5..37a0ed1081 100644
--- a/basis/ui/tools/profiler/profiler.factor
+++ b/basis/ui/tools/profiler/profiler.factor
@@ -8,7 +8,7 @@ ui.gadgets.panes ui.gadgets.scrollers ui.gadgets.tracks ui.gestures
 ui.gadgets.buttons ui.gadgets.tables ui.gadgets.search-tables
 ui.gadgets.labelled ui.gadgets.buttons ui.gadgets.packs
 ui.gadgets.labels ui.gadgets.tabbed ui.gadgets.status-bar
-ui.tools.browser ;
+ui.tools.browser ui.tools.common ;
 FROM: models.filter => <filter> ;
 FROM: models.compose => <compose> ;
 IN: ui.tools.profiler
@@ -20,6 +20,8 @@ words
 methods
 generic class ;
 
+TOOL: profiler-gadget { 700 400 }
+
 SINGLETON: word-renderer
 
 ! Value is a { word count } pair
@@ -139,8 +141,6 @@ M: method-renderer row-value drop first ;
             over <methods-tab> "Methods" add-tab
         1 track-add ;
 
-M: profiler-gadget pref-dim* call-next-method { 700 400 } vmax ;
-
 : profiler-help ( -- ) "ui-profiler" com-follow ;
 
 \ profiler-help H{ { +nullary+ t } } define-command
diff --git a/basis/ui/tools/walker/walker.factor b/basis/ui/tools/walker/walker.factor
index 67e30c49db..eeaa8a1f5b 100644
--- a/basis/ui/tools/walker/walker.factor
+++ b/basis/ui/tools/walker/walker.factor
@@ -3,7 +3,7 @@
 USING: accessors kernel concurrency.messaging inspector
 ui.tools.listener ui.tools.traceback ui.gadgets.buttons
 ui.gadgets.status-bar ui.gadgets.tracks ui.commands ui.gadgets
-models models.filter ui.tools.browser ui.gestures
+models models.filter ui.tools.browser ui.tools.common ui.gestures
 ui.gadgets.labels ui threads namespaces make tools.walker assocs
 combinators fry ;
 IN: ui.tools.walker
@@ -13,6 +13,8 @@ status continuation thread
 traceback
 closing? ;
 
+TOOL: walker-gadget { 620 620 }
+
 : walker-command ( walker msg -- )
     swap
     dup thread>> thread-registered?