diff --git a/addons/account/account_invoice_view.xml b/addons/account/account_invoice_view.xml
index fe8ed307aa6..42354bd1783 100644
--- a/addons/account/account_invoice_view.xml
+++ b/addons/account/account_invoice_view.xml
@@ -274,11 +274,11 @@
             <field name="arch" type="xml">
                 <form version="7.0">
                 <header>
-                    <button name="action_invoice_sent" type="object" string="Send by Email" states="open" attrs="{'invisible':['|',('sent','=',True), ('state', '=', 'draft')]}"/>
+                    <button name="action_invoice_sent" type="object" string="Send by Email" states="open" class="oe_form_button_active_flow" attrs="{'invisible':['|',('sent','=',True), ('state', '=', 'draft')]}"/>
                     <button name="invoice_print" string="Print Invoice" type="object" states="open" attrs="{'invisible':['|',('sent','=',True), ('state', '=', 'draft')]}"/>
-                    <button name="invoice_open" states="draft,proforma2" string="Validate"/>
+                    <button name="invoice_open" states="draft,proforma2" string="Validate" class="oe_form_button_active_flow"/>
                     <button name="invoice_proforma2" states="draft" string="PRO-FORMA" groups="account.group_proforma_invoices"/>
-                    <button name="%(action_account_invoice_refund)d" type='action' string='Refund Invoice' states='paid'/>
+                    <button name="%(action_account_invoice_refund)d" type='action' string='Refund Invoice' states='paid' class="oe_form_button_return_flow"/>
                     <button name="invoice_cancel" states="draft,proforma2,sale,open" string="Cancel" groups="base.group_no_one"/>
                     <button name="action_cancel_draft" states="cancel" string="Reset to Draft" type="object"/>
                     <button name='%(action_account_state_open)d' type='action' string='Re-Open' groups="account.group_account_invoice" attrs="{'invisible':['|', ('state','&lt;&gt;','paid'), ('reconciled', '=', True)]}" help="This button only appears when the state of the invoice is 'paid' (showing that it has been fully reconciled) and auto-computed boolean 'reconciled' is False (depicting that it's not the case anymore). In other words, the invoice has been dereconciled and it does not fit anymore the 'paid' state. You should press this button to re-open it and let it continue its normal process after having resolved the eventual exceptions it may have created."/>
diff --git a/addons/account_voucher/account_voucher_pay_invoice.xml b/addons/account_voucher/account_voucher_pay_invoice.xml
index da669ad04ee..688393d60d6 100644
--- a/addons/account_voucher/account_voucher_pay_invoice.xml
+++ b/addons/account_voucher/account_voucher_pay_invoice.xml
@@ -8,7 +8,7 @@
            <field name="inherit_id" ref="account.invoice_form"/>
            <field name="arch" type="xml">
            <button name="invoice_open" position="after">
-               <button name="invoice_pay_customer" type="object" string="Register Payment" states="open" icon="gtk-go-forward"/>
+               <button name="invoice_pay_customer" type="object" class="oe_form_button_active_flow" string="Register Payment" states="open" icon="gtk-go-forward"/>
            </button>
            </field>
         </record>
diff --git a/addons/hr_timesheet_invoice/hr_timesheet_invoice_view.xml b/addons/hr_timesheet_invoice/hr_timesheet_invoice_view.xml
index c18ac4de667..44c97c1e77d 100644
--- a/addons/hr_timesheet_invoice/hr_timesheet_invoice_view.xml
+++ b/addons/hr_timesheet_invoice/hr_timesheet_invoice_view.xml
@@ -24,9 +24,11 @@
                 </group>
                 <xpath expr="/form/sheet" position='before'>
                     <header>
-                        <button name="set_pending" string="Pending" type="object" states="open"/>
-                        <button name="set_close" string="Close" type="object" states="open,pending"/>
-                        <button name="set_open" string="Re-open project" type="object" states="pending,cancelled,close,draft"/>
+                        <button name="set_pending" string="Pending" type="object" states="open" class="oe_form_button_active_flow"/>
+                        <button name="set_close" string="Close" type="object" states="open" class="oe_form_button_active_flow"/>
+                        <button name="set_close" string="Close" type="object" states="pending" class="oe_form_button_return_flow"/>
+                        <button name="set_open" string="Re-open project" type="object" states="pending,close" class="oe_form_button_return_flow"/>
+                        <button name="set_open" string="Re-open project" type="object" states="cancelled,draft"/>
                         <button name="set_cancel" string="Cancel" type="object" states="open,pending"/>
                         <field name="state" readonly="1" widget="statusbar"
                             statusbar_visible="open,pending,close" statusbar_colors='{"pending":"red", "template":"blue"}'/>
diff --git a/addons/sale/sale_view.xml b/addons/sale/sale_view.xml
index b439c7ff4f0..16134b996df 100644
--- a/addons/sale/sale_view.xml
+++ b/addons/sale/sale_view.xml
@@ -108,18 +108,16 @@
                         <button name="invoice_corrected" states="invoice_except" string="Ignore Exception"/>
                         <button name="ship_recreate" states="shipping_except" string="Recreate Delivery Order"/>
                         <button name="ship_corrected" states="shipping_except" string="Ignore Exception"/>
-                        <button name="action_quotation_send" string="Send by Mail" type="object" states="draft" class="oe_form_button_hi"/>
-                        <button name="action_quotation_send" string="Send by Mail" type="object" states="sent"/>
+                        <button name="action_quotation_send" string="Send by Mail" type="object" states="draft,sent" class="oe_form_button_active_flow"/>
                         <button name="manual_invoice" states="manual" string="Create Final Invoice" type="object"/>
-                        <button name="print_quotation" string="Send by Post" type="object" states="draft" class="oe_form_button_hi"/>
-                        <button name="print_quotation" string="Send by Post" type="object" states="sent"/>
+                        <button name="print_quotation" string="Send by Post" type="object" states="draft,sent" class="oe_form_button_active_flow"/>
                         <button name="action_button_confirm" states="draft" string="Confirm" type="object"/>
-                        <button name="action_button_confirm" states="sent" string="Confirm" class="oe_form_button_hi" type="object"/>
-                        <button name="action_view_invoice" string="Open Invoice" type="object" 
+                        <button name="action_button_confirm" states="sent" string="Confirm" class="oe_form_button_active_flow" type="object"/>
+                        <button name="action_view_invoice" string="Open Invoice" type="object" class="oe_form_button_active_flow"
                           attrs="{'invisible': ['|','|',('state', '!=','progress'), ('invoiced', '=', True),('order_policy','=','picking')]}"/>
-                        <button name="action_view_delivery" string="Open Delivery Order" type="object" 
+                        <button name="action_view_delivery" string="Open Delivery Order" type="object" class="oe_form_button_active_flow"
                           attrs="{'invisible': ['|','|','|',('picking_ids','=',False),('picking_ids','=',[]), ('state', 'not in', ('progress','manual')),('shipped','=',True)]}"/>
-                        <button name="%(action_view_sale_advance_payment_inv)d" string="Advance Invoice" type="action" states="manual"/>
+                        <button name="%(action_view_sale_advance_payment_inv)d" string="Advance Invoice" type="action" states="manual" class="oe_form_button_active_flow"/>
                         <button name="cancel" states="draft,sent" string="Cancel"/>
                         <button name="action_cancel" states="manual,progress" string="Cancel" type="object"/>
                         <button name="ship_cancel" states="shipping_except" string="Cancel"/>
diff --git a/addons/stock_planning/stock_planning_view.xml b/addons/stock_planning/stock_planning_view.xml
index 0ae33cec3af..eee36b6d016 100644
--- a/addons/stock_planning/stock_planning_view.xml
+++ b/addons/stock_planning/stock_planning_view.xml
@@ -83,7 +83,7 @@
             <field name="arch" type="xml">
                 <form version="7.0">
                 <header>
-                    <button name="action_validate" string="Approve" states="draft" type="object" />
+                    <button name="action_validate" string="Approve" states="draft" type="object" class="oe_form_button_active_flow"/>
                     <field name="state" widget="statusbar"/>
                 </header>
                 <sheet string="Stock and Sales Forecast" layout="auto">