diff --git a/trytond/ir/module/module.xml b/trytond/ir/module/module.xml
index 7d72fc7d14..04825e3563 100644
--- a/trytond/ir/module/module.xml
+++ b/trytond/ir/module/module.xml
@@ -35,20 +35,20 @@
                             <field name="state" readonly="1"/>
                             <group col="6" colspan="2">
                                 <button string="Install" name="button_install"
-                                    type="object" states="state == 'uninstalled'"/>
+                                    type="object" states="{'invisible': '''state != 'uninstalled' '''}"/>
                                 <button string="Cancel Install" name="button_install_cancel"
-                                    type="object" states="state == 'to install'"/>
+                                    type="object" states="{'invisible': '''state != 'to install' '''}"/>
                                 <button string="Uninstall (beta)" name="button_uninstall"
-                                    type="object" states="state == 'installed'"/>
+                                    type="object" states="{'invisible': '''state != 'installed' '''}"/>
                                 <button string="Cancel Uninstall" name="button_uninstall_cancel"
-                                    type="object" states="state == 'to remove'"/>
+                                    type="object" states="{'invisible': '''state != 'to remove' '''}"/>
                                 <button string="Upgrade" name="button_upgrade"
-                                    type="object" states="state == 'installed'"/>
+                                    type="object" states="{'invisible': '''state != 'installed' '''}"/>
                                 <button string="Cancel Upgrade" name="button_upgrade_cancel"
-                                    type="object" states="state == 'to upgrade'"/>
+                                    type="object" states="{'invisible': '''state != 'to upgrade' '''}"/>
                                 <!--
                                 <button string="Update translations" name="button_update_translations"
-                                    type="object" states="state == 'installed'"/>
+                                    type="object" states="{'invisible': '''state != 'installed' '''}"/>
                                 -->
                             </group>
                         </page>
diff --git a/trytond/res/request.xml b/trytond/res/request.xml
index 74ffdfd02d..b90c734305 100644
--- a/trytond/res/request.xml
+++ b/trytond/res/request.xml
@@ -41,9 +41,9 @@
                             <label name="trigger_date"/>
                             <field name="trigger_date"/>
                             <group col="2" colspan="2">
-                                <button name="request_send" states="state in ('draft', 'active')"
+                                <button name="request_send" states="{'invisible': '''state not in ('draft', 'active')'''}"
                                     string="Send" type="object"/>
-                                <button name="request_reply" states="state == 'waiting'"
+                                <button name="request_reply" states="{'invisible': '''state != 'waiting' '''}"
                                     string="Reply" type="object"/>
                             </group>
                             <separator string="References" colspan="4"/>
@@ -60,7 +60,7 @@
                             <group col="3" colspan="2">
                                 <label name="active"/>
                                 <field name="active"/>
-                                <button name="request_close" states="state in ('waiting', 'draft', 'active')"
+                                <button name="request_close" states="{'invisible': '''state not in ('waiting', 'draft', 'active')'''}"
                                     string="Close" type="object"/>
                             </group>
                         </page>