diff --git a/trytond/ir/ui/form.rnc b/trytond/ir/ui/form.rnc
index 961262ee11..9974fbec4f 100644
--- a/trytond/ir/ui/form.rnc
+++ b/trytond/ir/ui/form.rnc
@@ -28,6 +28,8 @@ attlist.tree &= attribute on_write { text }?
 attlist.tree &= attribute editable { "top" | "bottom" }?
 attlist.tree &= attribute sequence { text }?
 attlist.tree &= attribute colors { text }?
+attlist.tree &=
+  [ a:defaultValue = "0" ] attribute fill { "0" | "1" }?
 
 graph = element graph { attlist.graph, x, y }
 attlist.graph &=
diff --git a/trytond/ir/ui/form.rng b/trytond/ir/ui/form.rng
index 439c6ca690..e9d90114a1 100644
--- a/trytond/ir/ui/form.rng
+++ b/trytond/ir/ui/form.rng
@@ -78,6 +78,16 @@
       <attribute name="colors"/>
     </optional>
   </define>
+  <define name="attlist.tree" combine="interleave">
+    <optional>
+       <attribute name="fill" a:defaultValue="0">
+          <choice>
+            <value>0</value>
+            <value>1</value>
+          </choice>
+       </attribute>
+    </optional>
+  </define>
   <define name="graph">
     <element name="graph">
       <ref name="attlist.graph"/>
diff --git a/trytond/ir/ui/tree.rnc b/trytond/ir/ui/tree.rnc
index c54f8615c1..84cb3d8ff0 100644
--- a/trytond/ir/ui/tree.rnc
+++ b/trytond/ir/ui/tree.rnc
@@ -7,6 +7,8 @@ attlist.tree &= attribute on_write { text }?
 attlist.tree &= attribute editable { "top" | "bottom" }?
 attlist.tree &= attribute sequence { text }?
 attlist.tree &= attribute colors { text }?
+attlist.tree &=
+  [ a:defaultValue = "0" ] attribute fill { "0" | "1" }?
 attlist.tree &=
   [ a:defaultValue = "0" ] attribute toolbar { "0" | "1" }?
 field = element field { attlist.field, empty }
diff --git a/trytond/ir/ui/tree.rng b/trytond/ir/ui/tree.rng
index 3e240937e7..b45871d5a2 100644
--- a/trytond/ir/ui/tree.rng
+++ b/trytond/ir/ui/tree.rng
@@ -38,6 +38,16 @@
       <attribute name="colors"/>
     </optional>
   </define>
+  <define name="attlist.tree" combine="interleave">
+    <optional>
+       <attribute name="fill" a:defaultValue="0">
+          <choice>
+            <value>0</value>
+            <value>1</value>
+          </choice>
+       </attribute>
+    </optional>
+  </define>
   <define name="attlist.tree" combine="interleave">
     <optional>
       <attribute name="toolbar" a:defaultValue="0">