diff --git a/tryton/gui/window/view_form/view/form.py b/tryton/gui/window/view_form/view/form.py
index 25c0997931..22d25eaec2 100644
--- a/tryton/gui/window/view_form/view/form.py
+++ b/tryton/gui/window/view_form/view/form.py
@@ -106,7 +106,10 @@ class ViewForm(ParserView):
 
                     tbutton = gtk.ToolButton(iconstock)
                     tbutton.set_use_underline(True)
-                    tbutton.set_label(tool['name'])
+                    text = tool['name']
+                    if '_' not in text:
+                        text = '_' + text
+                    tbutton.set_label(text)
                     gtktoolbar.insert(tbutton, -1)
 
                     tbutton.connect('clicked', self._action, tool, icontype)
diff --git a/tryton/gui/window/view_form/view/form_gtk/parser.py b/tryton/gui/window/view_form/view/form_gtk/parser.py
index 554f477495..15f4e6841a 100644
--- a/tryton/gui/window/view_form/view/form_gtk/parser.py
+++ b/tryton/gui/window/view_form/view/form_gtk/parser.py
@@ -19,8 +19,11 @@ class Button(object):
         super(Button, self).__init__()
         self.attrs = attrs or {}
         self.widget = gtk.Button()
+        text = attrs.get('string', _('Unknown'))
+        if '_' not in text:
+            text = '_' + text
         self.widget.set_use_underline(True)
-        self.widget.set_label(attrs.get('string', _('Unknown')))
+        self.widget.set_label(text)
         if attrs.get('icon', False):
             try:
                 stock = attrs['icon']
@@ -557,6 +560,8 @@ class ParserForm(ParserInterface):
                         text = fields[attrs['name']]['string']
                 if not text:
                     text = _('No String Attr.')
+                if '_' not in text:
+                    text = '_' + text
                 label = gtk.Label(text)
                 label.set_angle(angle)
                 label.set_use_underline(True)
diff --git a/tryton/gui/window/view_form/view/list.py b/tryton/gui/window/view_form/view/list.py
index 5439787b35..141c8c0712 100644
--- a/tryton/gui/window/view_form/view/list.py
+++ b/tryton/gui/window/view_form/view/list.py
@@ -193,7 +193,10 @@ class ViewList(ParserView):
 
                     tbutton = gtk.ToolButton(iconstock)
                     tbutton.set_use_underline(True)
-                    tbutton.set_label(tool['name'])
+                    text = tool['name']
+                    if '_' not in text:
+                        text = '_' + text
+                    tbutton.set_label(text)
                     gtktoolbar.insert(tbutton, -1)
 
                     tbutton.connect('clicked', self._action, tool, icontype)