diff --git a/src/zenity.ui b/src/zenity.ui
index edd3058..79827a9 100644
--- a/src/zenity.ui
+++ b/src/zenity.ui
@@ -62,10 +62,11 @@
           </packing>
         </child>
         <child>
-          <object class="GtkVBox" id="vbox13">
+          <object class="GtkBox" id="vbox13">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="border_width">5</property>
+            <property name="orientation">vertical</property>
             <property name="spacing">6</property>
             <child>
               <object class="GtkLabel" id="zenity_scale_text">
@@ -166,7 +167,7 @@
           </packing>
         </child>
         <child>
-          <object class="GtkVBox" id="vbox5">
+          <object class="GtkBox" id="vbox5">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="border_width">5</property>
@@ -277,13 +278,14 @@
           </packing>
         </child>
         <child>
-          <object class="GtkVBox" id="vbox1">
+          <object class="GtkBox" id="vbox1">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="border_width">5</property>
+            <property name="orientation">vertical</property>
             <property name="spacing">6</property>
             <child>
-              <object class="GtkVBox" id="vbox2">
+              <object class="GtkBox" id="vbox2">
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
                 <property name="spacing">6</property>
@@ -406,12 +408,13 @@
           </packing>
         </child>
         <child>
-          <object class="GtkVBox" id="vbox3">
+          <object class="GtkBox" id="vbox3">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="border_width">6</property>
+            <property name="orientation">vertical</property>
             <child>
-              <object class="GtkVBox" id="vbox4">
+              <object class="GtkBox" id="vbox4">
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
                 <property name="spacing">6</property>
@@ -493,12 +496,12 @@
           </packing>
         </child>
         <child>
-          <object class="GtkVBox" id="vbox8">
+          <object class="GtkBox" id="vbox8">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="border_width">6</property>
             <child>
-              <object class="GtkHBox" id="hbox3">
+              <object class="GtkBox" id="hbox3">
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
                 <property name="border_width">5</property>
@@ -681,7 +684,7 @@
           </packing>
         </child>
         <child>
-          <object class="GtkHBox" id="hbox4">
+          <object class="GtkBox" id="hbox4">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="border_width">5</property>
@@ -784,10 +787,11 @@
           </packing>
         </child>
         <child>
-          <object class="GtkVBox" id="vbox7">
+          <object class="GtkBox" id="vbox7">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="border_width">5</property>
+            <property name="orientation">vertical</property>
             <property name="spacing">6</property>
             <child>
               <object class="GtkLabel" id="zenity_progress_text">
@@ -867,7 +871,7 @@
           </packing>
         </child>
         <child>
-          <object class="GtkHBox" id="hbox1">
+          <object class="GtkBox" id="hbox1">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="border_width">5</property>
@@ -967,10 +971,11 @@
           </packing>
         </child>
         <child>
-          <object class="GtkVBox" id="vbox10">
+          <object class="GtkBox" id="vbox10">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="border_width">5</property>
+            <property name="orientation">vertical</property>
             <property name="spacing">6</property>
             <child>
               <object class="GtkLabel" id="zenity_tree_text">
@@ -1062,7 +1067,7 @@
           </packing>
         </child>
         <child>
-          <object class="GtkHBox" id="hbox2">
+          <object class="GtkBox" id="hbox2">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="border_width">5</property>