diff --git a/code/nel/tools/3d/object_viewer_qt/src/plugins/gui_editor/widgets/ControlBase.xml b/code/nel/tools/3d/object_viewer_qt/src/plugins/gui_editor/widgets/ControlBase.xml
new file mode 100644
index 000000000..3f092e135
--- /dev/null
+++ b/code/nel/tools/3d/object_viewer_qt/src/plugins/gui_editor/widgets/ControlBase.xml
@@ -0,0 +1,21 @@
+<widget>
+    <header>
+        <name>CtrlBase</name>
+        <guiname>cb</guiname>
+        <description></description>
+        <abstract>true</abstract>
+        <icon></icon>
+    </header>
+    <properties>
+        <property>
+            <name>on_tooltip</name>
+            <type>string</type>
+            <default>handler</default>
+        </property>
+        <property>
+            <name>on_tooltip_params</name>
+            <type>string</type>
+            <default>params</default>
+        </property>
+    </properties>
+</widget>
diff --git a/code/nel/tools/3d/object_viewer_qt/src/plugins/gui_editor/widgets/InterfaceElement.xml b/code/nel/tools/3d/object_viewer_qt/src/plugins/gui_editor/widgets/InterfaceElement.xml
new file mode 100644
index 000000000..e8a3f0aa2
--- /dev/null
+++ b/code/nel/tools/3d/object_viewer_qt/src/plugins/gui_editor/widgets/InterfaceElement.xml
@@ -0,0 +1,21 @@
+<widget>
+    <header>
+        <name>InterfaceElement</name>
+        <guiname>ie</guiname>
+        <description></description>
+        <abstract>true</abstract>
+        <icon></icon>
+    </header>
+    <properties>
+        <property>
+            <name>id</name>
+            <type>string</type>
+            <default>ie</default>
+        </property>
+        <property>
+            <name>active</name>
+            <type>bool</type>
+            <default>true</default>
+        </property>
+    </properties>
+</widget>