diff --git a/tryton/gui/window/view_form/model/field.py b/tryton/gui/window/view_form/model/field.py
index 76b7bc3db7..336d59b376 100644
--- a/tryton/gui/window/view_form/model/field.py
+++ b/tryton/gui/window/view_form/model/field.py
@@ -87,16 +87,21 @@ class CharField(object):
     def create(self, model):
         return False
 
-    def state_set(self, model, state='draft'):
-        state_changes = dict(self.attrs.get('states', {}).get(state, []))
+    def state_set(self, model, values=None):
+        if values is None:
+            values = {'state': 'draft'}
+        state_changes = self.attrs.get('states', {})
         for key in ('readonly', 'required'):
             if key in state_changes:
-                self.get_state_attrs(model)[key] = state_changes[key]
+                self.get_state_attrs(model)[key] = \
+                        eval(state_changes[key], values)
             else:
                 self.get_state_attrs(model)[key] = self.attrs[key]
         if 'value' in state_changes:
-            self.set(model, state_changes['value'], test_state=False,
-                    modified=True)
+            value = eval(state_changes['value'], values)
+            if value:
+                self.set(model, value, test_state=False,
+                        modified=True)
 
     def get_state_attrs(self, model):
         if self.name not in model.state_attrs:
diff --git a/tryton/gui/window/view_form/view/form.py b/tryton/gui/window/view_form/view/form.py
index 189b5c9085..573f9f38f7 100644
--- a/tryton/gui/window/view_form/view/form.py
+++ b/tryton/gui/window/view_form/view/form.py
@@ -18,13 +18,15 @@ class ViewWidget(object):
         self.widget._view = self
         self.widget_name = widget_name
 
-    def display(self, model, state='draft'):
+    def display(self, model, values=None):
+        if values is None:
+            values = {'state': 'draft'}
         if not model:
             self.widget.display(model, False)
             return False
         modelfield = model.mgroup.mfields.get(self.widget_name, None)
         if modelfield:
-            modelfield.state_set(model, state)
+            modelfield.state_set(model, values)
             self.widget.display(model, modelfield)
         elif isinstance(self.widget, Action):
             self.widget.display(model, False)
@@ -258,14 +260,14 @@ class ViewForm(ParserView):
 
     def display(self):
         model = self.screen.current_model
-        if model and ('state' in model.mgroup.fields):
-            state = model['state'].get(model)
-        else:
-            state = 'draft'
+        values = {'state': 'draft'}
+        if model:
+            for field in model.mgroup.fields:
+                values[field] = model[field].get(model)
         for widget in self.widgets.values():
-            widget.display(model, state)
+            widget.display(model, values)
         for button in self.buttons:
-            button.state_set(state)
+            button.state_set(values)
         return True
 
     def set_cursor(self, new=False):
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 6d93ef2e8a..2ea3a996de 100644
--- a/tryton/gui/window/view_form/view/form_gtk/parser.py
+++ b/tryton/gui/window/view_form/view/form_gtk/parser.py
@@ -66,16 +66,16 @@ class Button(object):
                         _('Invalid Form, correct red fields!'))
             self.form.screen.display()
 
-    def state_set(self, state):
+    def state_set(self, values):
         if self.attrs.get('states', False):
-            my_states = self.attrs.get('states', '').split(',')
-            if state not in my_states:
-                self.widget.hide()
-            else:
+            if eval(self.attrs.get('states', 'True'), values):
                 self.widget.show()
+            else:
+                self.widget.hide()
         else:
             self.widget.show()
 
+
 class _container(object):
     def __init__(self, tooltips):
         self.cont = []