diff --git a/fields/__init__.py b/fields/__init__.py
index 936fb6d..5a50bcc 100644
--- a/fields/__init__.py
+++ b/fields/__init__.py
@@ -39,6 +39,7 @@ class Field:
     # field, keyed by layoutType.
     cssFiles = {}
     jsFiles = {}
+    bLayouts = Table('lrv-f', width=None)
     dLayouts = 'lrv-d-f'
     hLayouts = 'lhrv-f'
     wLayouts = Table('lrv-f')
@@ -98,10 +99,10 @@ class Field:
     # Button for showing changes to the field.
     pxChanges = Px('''<x if=":zobj.hasHistory(name)"><img class="clickable"
      if="not showChanges" src=":url('changes')" title="_('changes_show')"
-     onclick=":'askField(%s,%s,%s,%s)' % \
+     onclick=":'askField(%s,%s,%s,null,%s)' % \
                (q(tagId), q(zobj.absolute_url()), q('view'), q('True'))"/><img
      class="clickable" if="showChanges" src=":url('changesNo')"
-     onclick=":'askField(%s,%s,%s,%s)' % \
+     onclick=":'askField(%s,%s,%s,null,%s)' % \
                (q(tagId), q(zobj.absolute_url(), q('view'), q('True'))"
      title=":_('changes_hide')"/></x>''')
 
diff --git a/gen/ui/appy.js b/gen/ui/appy.js
index 3dc9fd8..58ca81c 100644
--- a/gen/ui/appy.js
+++ b/gen/ui/appy.js
@@ -280,8 +280,8 @@ function askRefField(hookId, objectUrl, innerRef, startNumber, action,
                evalInnerScripts);
 }
 
-function askField(hookId, objectUrl, layoutType, showChanges, masterValues,
-                  requestValue, error, className, customParams){
+function askField(hookId, objectUrl, layoutType, customParams, showChanges,
+                  masterValues, requestValue, error, className){
   // Sends an Ajax request for getting the content of any field.
   var fieldName = hookId.split('_')[1];
   var params = {'layoutType': layoutType, 'showChanges': showChanges};
@@ -530,8 +530,8 @@ function updateSlaves(master, slave, objectUrl, layoutType, requestValues,
       var err = null;
       if (errors && (slaveName in errors))
         err = errors[slaveName];
-      askField(slaveId, objectUrl, layoutType, false, masterValues, reqValue,
-               err, className);
+      askField(slaveId, objectUrl, layoutType, null, false, masterValues,
+               reqValue, err, className);
     }
   }
 }
@@ -1052,12 +1052,12 @@ function onSelectObjects(nodeId, objectUrl, mode, sortKey, sortOrder,
   if (mode == 'repl') {
     /* Link the selected objects (and unlink the potentially already linked
        ones) and refresh the Ref edit widget. */
-    askField(':'+nodeId,objectUrl,'edit',null,null,null,null,null,params);
+    askField(':'+nodeId, objectUrl, 'edit', params, false);
   }
   else {
     // Link the selected objects and refresh the Ref view widget.
     params['action'] = 'onSelectFromPopup';
-    askField(':'+nodeId,objectUrl,'view',null,null,null,null,null,params);
+    askField(':'+nodeId, objectUrl, 'view', params, false);
   }
 }
 
@@ -1073,10 +1073,10 @@ function onSelectObject(tdId, nodeId, objectUrl) {
   else {
     /* Close the popup and directly refresh the initiator field with the
        selected object. */
-    var uids=checkbox.value;
+    var uids = checkbox.value;
     closePopup('iframePopup');
-    askField(':'+nodeId, objectUrl, 'edit', null, null, null, null, null,
-             {'selected': uids, 'semantics': 'checked'});
+    var params = {'selected': uids, 'semantics': 'checked'};
+    askField(':'+nodeId, objectUrl, 'edit', params, false);
   }
 }
 
diff --git a/gen/wrappers/__init__.py b/gen/wrappers/__init__.py
index 45ea513..06b49e6 100644
--- a/gen/wrappers/__init__.py
+++ b/gen/wrappers/__init__.py
@@ -632,6 +632,7 @@ class AbstractWrapper(object):
              dummy=setattr(req, 'pxContext', _ctx_);
              lang=ztool.getUserLanguage();   q=ztool.quote;
              action=req.get('action', None);
+             actionObj=(action and action.startswith(':')) and obj or zobj;
              px=req['px'].split(':');
              inPopup=req.get('popup') == '1';
              className=(len(px) == 3) and px[0] or None;
@@ -646,8 +647,8 @@ class AbstractWrapper(object):
              x=resp.setHeader('CacheControl', 'no-cache')">
 
       <!-- If an action is defined, execute it on p_zobj or on p_field. -->
-      <x if="action and not field" var2="x=getattr(zobj, action)()"></x>
-      <x if="action and field" var2="x=getattr(field, action)(zobj)"></x>
+      <x if="action and not field" var2="x=getattr(actionObj, action)()"></x>
+      <x if="action and field" var2="x=getattr(field, action)(actionObj)"></x>
 
       <!-- Then, call the PX on p_obj or on p_field. -->
       <x if="not field">:getattr(obj, px[0])</x>