diff --git a/tryton/tryton/gui/window/email_.py b/tryton/tryton/gui/window/email_.py
index e976fb6211..abada7ce19 100644
--- a/tryton/tryton/gui/window/email_.py
+++ b/tryton/tryton/gui/window/email_.py
@@ -355,3 +355,9 @@ class Email(NoModal):
     def destroy(self):
         super().destroy()
         self.dialog.destroy()
+
+    def show(self):
+        self.dialog.show()
+
+    def hide(self):
+        self.dialog.hide()