add button registrado

recepcion.py

@@ -1,6 +1,6 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-from trytond.model import (ModelSQL, ModelView, fields)
+from trytond.model import (ModelSQL, ModelView, fields, Workflow)
 from datetime import datetime
 
 class Recepcion(ModelView, ModelSQL):
@@ -14,6 +14,7 @@ class Recepcion(ModelView, ModelSQL):
     descripcion = fields.Text("Descripcion")
     estado = fields.Selection([("borrador","Borrador"),("registrado", "Registrado")],"Estado")
 
+
     @classmethod
     def default_hora_entrada(cls):
         return datetime.now()
@@ -22,6 +23,17 @@ class Recepcion(ModelView, ModelSQL):
     def default_estado(cls):
         return "borrador"
 
+    @classmethod         #constructor clase
+    def __setup__(cls):
+        super(Recepcion, cls).__setup__()
+        cls._transitions=({("borrador","registrado"),("registrado","borrador") })
+        cls._buttons.update({"registrado":{}})
+    
+    @classmethod
+    @ModelView.button
+    @Workflow.transition("registrado")
+    def registrado(cls, records):
+        pass
      
 
         

recepcion.xml

@@ -7,6 +7,11 @@ this repository contains the full copyright notices and license terms. -->
 	    <field name="model">taller.recepcion</field>
 	    <field name="type">form</field>
 	    <field name="name">recepcion_form</field>
+        </record>
+	<record model="ir.model.button" id="registrado_recepcion_button">
+		<field name="name">registrado</field>
+	        <field name="string">Registrado</field>
+		<field name="model" search="[('model', '=', 'taller.recepcion')]"/>
 	</record>
     </data>
 </tryton>

view/recepcion_form.xml

@@ -17,5 +17,7 @@ this repository contains the full copyright notices and license terms. -->
 	<field name="descripcion"/>
 	<label name="estado"/>
 	<field name="estado"/>
+	<button name="registrado"/>
+	
 
 </form>