diff --git a/gen/mixins/ToolMixin.py b/gen/mixins/ToolMixin.py
index 1221780..2b50bab 100644
--- a/gen/mixins/ToolMixin.py
+++ b/gen/mixins/ToolMixin.py
@@ -1422,4 +1422,16 @@ class ToolMixin(BaseMixin):
         if version < self.ieMin:
             mapping = {'version': version, 'min': self.ieMin}
             return self.translate('wrong_browser', mapping=mapping)
+
+    def executeAjaxAction(self, action, obj, field):
+        '''When PX "pxAjax" is called to get some chunk of XHTML via an Ajax
+           request, a server action can be executed before rendering the XHTML
+           chunk. This method executes this action.'''
+        if action.startswith(':'):
+            # The action corresponds to a method on Appy p_obj.
+            getattr(obj, action[1:])()
+        else:
+            # The action must be executed on p_field if present, on obj.o else.
+            if field: getattr(field, action)(obj.o)
+            else: getattr(obj.o, action)()
 # ------------------------------------------------------------------------------
diff --git a/gen/ui/appy.js b/gen/ui/appy.js
index 58ca81c..01a10a2 100644
--- a/gen/ui/appy.js
+++ b/gen/ui/appy.js
@@ -803,6 +803,7 @@ function askConfirm(actionType, action, msg, showComment) {
   var confirmForm = document.getElementById('confirmActionForm');
   confirmForm.actionType.value = actionType;
   confirmForm.action.value = action;
+  if (!msg) msg = action_confirm;
   var commentArea = document.getElementById('commentArea');
   if (showComment) commentArea.style.display = 'block';
   else commentArea.style.display = 'none';
diff --git a/gen/wrappers/ToolWrapper.py b/gen/wrappers/ToolWrapper.py
index 98df25a..f9b5aa6 100644
--- a/gen/wrappers/ToolWrapper.py
+++ b/gen/wrappers/ToolWrapper.py
@@ -505,13 +505,13 @@ class ToolWrapper(AbstractWrapper):
         </x>
        </p>
        <table width="100%">
-        <tr>
+        <tr valign="top">
          <!-- Search description -->
          <td if="uiSearch.translatedDescr">
           <span class="discreet">:uiSearch.translatedDescr</span><br/>
          </td>
          <!-- (Top) navigation -->
-         <td align=":dright" width="25%"><x>:tool.pxNavigate</x></td>
+         <td align=":dright" width="150px"><x>:tool.pxNavigate</x></td>
         </tr>
        </table>
 
diff --git a/gen/wrappers/__init__.py b/gen/wrappers/__init__.py
index 06b49e6..971572f 100644
--- a/gen/wrappers/__init__.py
+++ b/gen/wrappers/__init__.py
@@ -49,7 +49,7 @@ class AbstractWrapper(object):
 
     pxNavigationStrip = Px('''
      <table width="100%">
-      <tr>
+      <tr valign="top">
        <!-- Breadcrumb -->
        <td var="sup=zobj.getSupBreadCrumb();
                 breadcrumb=zobj.getBreadCrumb(inPopup=inPopup);
@@ -65,7 +65,7 @@ class AbstractWrapper(object):
         <x if="sub">::sub</x>
        </td>
        <!-- Object navigation -->
-       <td align=":dright">:obj.pxNavigateSiblings</td>
+       <td align=":dright" width="150px">:obj.pxNavigateSiblings</td>
       </tr>
      </table>
      <!-- Object phases and pages -->
@@ -631,8 +631,7 @@ class AbstractWrapper(object):
              req=ztool.REQUEST;              resp=req.RESPONSE;
              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;
+             action=req.get('action', '');
              px=req['px'].split(':');
              inPopup=req.get('popup') == '1';
              className=(len(px) == 3) and px[0] or None;
@@ -647,8 +646,7 @@ 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(actionObj, action)()"></x>
-      <x if="action and field" var2="x=getattr(field, action)(actionObj)"></x>
+      <x if="action" var2="x=ztool.executeAjaxAction(action, obj, field)"></x>
 
       <!-- Then, call the PX on p_obj or on p_field. -->
       <x if="not field">:getattr(obj, px[0])</x>
@@ -1134,4 +1132,6 @@ class AbstractWrapper(object):
         localRoles = PersistentMapping({ self.o.creator: ['Owner'] })
         self.o.__ac_local_roles__ = localRoles
         return localRoles
+
+    def raiseUnauthorized(self, msg=None): return self.o.raiseUnauthorized(msg)
 # ------------------------------------------------------------------------------