diff --git a/addons/base_calendar/base_calendar_view.xml b/addons/base_calendar/base_calendar_view.xml
index fa073938a37..eeaa71b3eed 100644
--- a/addons/base_calendar/base_calendar_view.xml
+++ b/addons/base_calendar/base_calendar_view.xml
@@ -10,20 +10,10 @@
             <field name="arch" type="xml">
                 <form string="Invitation details" version="7.0">
                     <header>
-                        <button name="do_tentative"
-                            states="needs-action,declined,accepted"
-                            string="Uncertain" type="object"/>
-                        <button name="do_accept" string="Accept"
-                            states="needs-action,tentative,declined"
-                            type="object" />
-                        <button
-                            name="%(base_calendar.action_view_calendar_invite_attendee_wizard)d"
-                            string="Delegate" type="action"
-                            states="needs-action,tentative,declined,accepted"
-                            context="{'model' : 'calendar.attendee', 'attendee_field' : 'child_ids'}" />
-                        <button name="do_decline" string="Decline"
-                            states="needs-action,tentative,accepted"
-                            type="object" />
+                        <button name="do_tentative" states="needs-action,declined,accepted" string="Uncertain" type="object" class="oe_form_button_active_flow"/>
+                        <button name="do_accept" string="Accept" states="needs-action,tentative,declined" type="object" class="oe_form_button_active_flow"/>
+                        <button name="%(base_calendar.action_view_calendar_invite_attendee_wizard)d" string="Delegate" type="action" states="needs-action,tentative,declined,accepted" context="{'model' : 'calendar.attendee', 'attendee_field' : 'child_ids'}" />
+                        <button name="do_decline" string="Decline" states="needs-action,tentative,accepted" type="object" class="oe_form_button_active_flow"/>
                         <field name="state" widget="statusbar"
                             statusbar_visible="tentative,needs-action,accepted" statusbar_colors='{"proforma":"blue"}'/>
                     </header>
@@ -211,21 +201,9 @@
             <field name="arch" type="xml">
                 <form string="Events" version="7.0">
                 <header>
-                    <button name="do_confirm"
-                        string="Confirm"
-                        states="tentative,cancelled"
-                        type="object"
-                        />
-                    <button name="do_tentative"
-                        states="confirmed,cancelled"
-                        string="Uncertain"
-                        type="object"
-                        />
-                    <button name="do_cancel"
-                        string="Cancel"
-                        states="tentative,confirmed"
-                        type="object"
-                        />
+                    <button name="do_confirm" string="Confirm" states="tentative,cancelled" type="object" class="oe_form_button_active_flow"/>
+                    <button name="do_tentative" states="confirmed,cancelled" string="Uncertain" type="object" class="oe_form_button_active_flow"/>
+                    <button name="do_cancel" string="Cancel" states="tentative,confirmed" type="object" />
                     <field name="state" widget="statusbar"
                         statusbar_visible="tentative,confirmed" statusbar_colors='{"proforma":"blue"}'/>
                 </header>
diff --git a/addons/crm_fundraising/crm_fundraising_view.xml b/addons/crm_fundraising/crm_fundraising_view.xml
index eb7bcade10b..a1cb6a82e5d 100644
--- a/addons/crm_fundraising/crm_fundraising_view.xml
+++ b/addons/crm_fundraising/crm_fundraising_view.xml
@@ -63,11 +63,11 @@
             <field name="arch" type="xml">
                 <form version="7.0">
                 <header>
-                    <button name="case_close" string="Done" states="open,pending" type="object" />
-                    <button name="case_open" string="Open" states="draft,pending" type="object" />
-                    <button name="case_pending" string="Pending" states="draft,open" type="object" />
-                    <button name="case_escalate" string="Escalate" states="open,draft,pending" type="object" groups="base.group_extended" />
-                    <button name="case_reset" string="Reset to Draft" states="done,cancel" type="object" />
+                    <button name="case_close" string="Done" states="open,pending" type="object" class="oe_form_button_active_flow"/>
+                    <button name="case_open" string="Open" states="draft,pending" type="object" class="oe_form_button_active_flow"/>
+                    <button name="case_pending" string="Pending" states="draft,open" type="object" class="oe_form_button_active_flow"/>
+                    <button name="case_escalate" string="Escalate" states="open,draft,pending" type="object" groups="base.group_extended" class="oe_form_button_return_flow"/>
+                    <button name="case_reset" string="Reset to Draft" states="done,cancel" type="object" class="oe_form_button_return_flow"/>
                     <button name="case_cancel" string="Cancel" states="draft,open,pending" type="object" />
                     <field name="state" widget="statusbar" nolabel="1" statusbar_visible="draft,open,done" statusbar_colors='{"pending":"blue"}'/>
                 </header>
diff --git a/addons/sale/sale_view.xml b/addons/sale/sale_view.xml
index 16134b996df..c86b2ceb4c8 100644
--- a/addons/sale/sale_view.xml
+++ b/addons/sale/sale_view.xml
@@ -400,8 +400,8 @@
                 <form string="Sales Order Lines" version="7.0">
                     <header>
                         <button name="button_cancel" string="Cancel" type="object" icon="gtk-cancel" states="confirmed,exception"/>
-                        <button name="%(action_view_sale_order_line_make_invoice)d" string="Create Invoice" type="action" states="done" icon="gtk-go-forward" attrs="{'invisible': [('invoiced', '=', 1)]}"/>
-                        <button name="button_done" string="Done" type="object" states="confirmed,exception" icon="gtk-go-forward"/>
+                        <button name="%(action_view_sale_order_line_make_invoice)d" string="Create Invoice" type="action" states="done" icon="gtk-go-forward" attrs="{'invisible': [('invoiced', '=', 1)]}" class="oe_form_button_active_flow"/>
+                        <button name="button_done" string="Done" type="object" states="confirmed,exception" icon="gtk-go-forward" class="oe_form_button_active_flow"/>
                         <field name="state" widget="statusbar" statusbar_visible="draft,confirmed,done" statusbar_colors='{"exception":"red","cancel":"red"}'/>
                     </header>
                     <label for="order_id" class="oe_form_readonly_hidden"/>