diff --git a/src/settings-dialog.ui b/src/settings-dialog.ui
index 2223930..43c509c 100644
--- a/src/settings-dialog.ui
+++ b/src/settings-dialog.ui
@@ -1,8 +1,9 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Generated with glade 3.18.3 -->
 <interface>
-  <!-- interface-requires gtk+ 2.12 -->
-  <!-- interface-naming-policy project-wide -->
+  <requires lib="gtk+" version="3.0"/>
   <object class="GtkDialog" id="settings-dialog">
+    <property name="can_focus">False</property>
     <property name="border_width">5</property>
     <property name="title" translatable="yes">Settings for Task Manager</property>
     <property name="resizable">False</property>
@@ -10,12 +11,39 @@
     <property name="destroy_with_parent">True</property>
     <property name="icon_name">gtk-preferences</property>
     <property name="type_hint">normal</property>
-    <property name="has_separator">False</property>
     <child internal-child="vbox">
       <object class="GtkBox" id="dialog-vbox">
         <property name="visible">True</property>
+        <property name="can_focus">False</property>
         <property name="orientation">vertical</property>
         <property name="spacing">2</property>
+        <child internal-child="action_area">
+          <object class="GtkButtonBox" id="dialog-action_area">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+            <property name="layout_style">end</property>
+            <child>
+              <object class="GtkButton" id="button-close">
+                <property name="label">gtk-close</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="use_stock">True</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">False</property>
+                <property name="position">0</property>
+              </packing>
+            </child>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="fill">False</property>
+            <property name="pack_type">end</property>
+            <property name="position">0</property>
+          </packing>
+        </child>
         <child>
           <object class="GtkNotebook" id="notebook">
             <property name="visible">True</property>
@@ -24,25 +52,30 @@
             <child>
               <object class="GtkBox" id="hbox">
                 <property name="visible">True</property>
+                <property name="can_focus">False</property>
                 <property name="border_width">6</property>
                 <child>
                   <object class="GtkBox" id="vbox1">
                     <property name="visible">True</property>
+                    <property name="can_focus">False</property>
                     <property name="orientation">vertical</property>
                     <property name="spacing">6</property>
                     <child>
                       <object class="GtkFrame" id="frame-interface">
                         <property name="visible">True</property>
+                        <property name="can_focus">False</property>
                         <property name="label_xalign">0</property>
                         <property name="shadow_type">none</property>
                         <child>
                           <object class="GtkAlignment" id="alignment-interface">
                             <property name="visible">True</property>
+                            <property name="can_focus">False</property>
                             <property name="top_padding">6</property>
                             <property name="left_padding">12</property>
                             <child>
                               <object class="GtkBox" id="vbox-interface">
                                 <property name="visible">True</property>
+                                <property name="can_focus">False</property>
                                 <property name="orientation">vertical</property>
                                 <property name="spacing">6</property>
                                 <child>
@@ -51,9 +84,12 @@
                                     <property name="visible">True</property>
                                     <property name="can_focus">True</property>
                                     <property name="receives_default">False</property>
+                                    <property name="xalign">0.5</property>
                                     <property name="draw_indicator">True</property>
                                   </object>
                                   <packing>
+                                    <property name="expand">False</property>
+                                    <property name="fill">True</property>
                                     <property name="position">0</property>
                                   </packing>
                                 </child>
@@ -63,6 +99,7 @@
                                     <property name="visible">True</property>
                                     <property name="can_focus">True</property>
                                     <property name="receives_default">False</property>
+                                    <property name="xalign">0.5</property>
                                     <property name="draw_indicator">True</property>
                                   </object>
                                   <packing>
@@ -77,6 +114,7 @@
                                     <property name="visible">True</property>
                                     <property name="can_focus">True</property>
                                     <property name="receives_default">False</property>
+                                    <property name="xalign">0.5</property>
                                     <property name="draw_indicator">True</property>
                                   </object>
                                   <packing>
@@ -106,6 +144,7 @@
                                     <property name="visible">True</property>
                                     <property name="can_focus">True</property>
                                     <property name="receives_default">False</property>
+                                    <property name="xalign">0.5</property>
                                     <property name="draw_indicator">True</property>
                                   </object>
                                   <packing>
@@ -120,6 +159,7 @@
                                     <property name="visible">True</property>
                                     <property name="can_focus">True</property>
                                     <property name="receives_default">False</property>
+                                    <property name="xalign">0.5</property>
                                     <property name="draw_indicator">True</property>
                                   </object>
                                   <packing>
@@ -131,10 +171,12 @@
                                 <child>
                                   <object class="GtkBox" id="hbox-toolbar-style">
                                     <property name="visible">True</property>
+                                    <property name="can_focus">False</property>
                                     <property name="spacing">6</property>
                                     <child>
                                       <object class="GtkLabel" id="label-toolbar-style">
                                         <property name="visible">True</property>
+                                        <property name="can_focus">False</property>
                                         <property name="label" translatable="yes">Toolbar style:</property>
                                       </object>
                                       <packing>
@@ -160,6 +202,7 @@
                         <child type="label">
                           <object class="GtkLabel" id="label-interface">
                             <property name="visible">True</property>
+                            <property name="can_focus">False</property>
                             <property name="label" translatable="yes">&lt;b&gt;Interface style&lt;/b&gt;</property>
                             <property name="use_markup">True</property>
                           </object>
@@ -174,16 +217,19 @@
                     <child>
                       <object class="GtkFrame" id="frame-misc">
                         <property name="visible">True</property>
+                        <property name="can_focus">False</property>
                         <property name="label_xalign">0</property>
                         <property name="shadow_type">none</property>
                         <child>
                           <object class="GtkAlignment" id="alignment-misc">
                             <property name="visible">True</property>
+                            <property name="can_focus">False</property>
                             <property name="top_padding">6</property>
                             <property name="left_padding">12</property>
                             <child>
                               <object class="GtkBox" id="vbox-misc">
                                 <property name="visible">True</property>
+                                <property name="can_focus">False</property>
                                 <property name="orientation">vertical</property>
                                 <property name="spacing">6</property>
                                 <child>
@@ -192,6 +238,7 @@
                                     <property name="visible">True</property>
                                     <property name="can_focus">True</property>
                                     <property name="receives_default">False</property>
+                                    <property name="xalign">0.5</property>
                                     <property name="draw_indicator">True</property>
                                   </object>
                                   <packing>
@@ -206,6 +253,7 @@
                                     <property name="visible">True</property>
                                     <property name="can_focus">True</property>
                                     <property name="receives_default">False</property>
+                                    <property name="xalign">0.5</property>
                                     <property name="draw_indicator">True</property>
                                   </object>
                                   <packing>
@@ -221,6 +269,7 @@
                         <child type="label">
                           <object class="GtkLabel" id="label-misc">
                             <property name="visible">True</property>
+                            <property name="can_focus">False</property>
                             <property name="label" translatable="yes">&lt;b&gt;Miscellaneous&lt;/b&gt;</property>
                             <property name="use_markup">True</property>
                           </object>
@@ -234,46 +283,56 @@
                     </child>
                   </object>
                   <packing>
+                    <property name="expand">False</property>
+                    <property name="fill">True</property>
                     <property name="position">0</property>
                   </packing>
                 </child>
                 <child>
                   <object class="GtkSeparator" id="vseparator1">
+                    <property name="can_focus">False</property>
                     <property name="orientation">vertical</property>
                   </object>
                   <packing>
                     <property name="expand">False</property>
+                    <property name="fill">True</property>
                     <property name="padding">6</property>
                     <property name="position">1</property>
                   </packing>
                 </child>
                 <child>
                   <object class="GtkBox" id="vbox2">
+                    <property name="can_focus">False</property>
                     <property name="orientation">vertical</property>
                     <property name="spacing">6</property>
                     <child>
                       <object class="GtkFrame" id="frame-information">
                         <property name="visible">True</property>
                         <property name="sensitive">False</property>
+                        <property name="can_focus">False</property>
                         <property name="label_xalign">0</property>
                         <property name="shadow_type">none</property>
                         <child>
                           <object class="GtkAlignment" id="alignment-information">
                             <property name="visible">True</property>
+                            <property name="can_focus">False</property>
                             <property name="top_padding">6</property>
                             <property name="left_padding">12</property>
                             <child>
                               <object class="GtkBox" id="vbox-information">
                                 <property name="visible">True</property>
+                                <property name="can_focus">False</property>
                                 <property name="orientation">vertical</property>
                                 <property name="spacing">6</property>
                                 <child>
                                   <object class="GtkBox" id="hbox-refresh-rate">
                                     <property name="visible">True</property>
+                                    <property name="can_focus">False</property>
                                     <property name="spacing">6</property>
                                     <child>
                                       <object class="GtkLabel" id="label-refresh-rate">
                                         <property name="visible">True</property>
+                                        <property name="can_focus">False</property>
                                         <property name="label" translatable="yes">Refresh rate:</property>
                                       </object>
                                       <packing>
@@ -285,6 +344,7 @@
                                     <child>
                                       <object class="GtkComboBox" id="combobox-refresh-rate">
                                         <property name="visible">True</property>
+                                        <property name="can_focus">False</property>
                                       </object>
                                       <packing>
                                         <property name="expand">False</property>
@@ -302,6 +362,7 @@
                                 <child>
                                   <object class="GtkLabel" id="label-columns">
                                     <property name="visible">True</property>
+                                    <property name="can_focus">False</property>
                                     <property name="xalign">0</property>
                                     <property name="label" translatable="yes">Columns:</property>
                                   </object>
@@ -314,6 +375,7 @@
                                 <child>
                                   <object class="GtkAlignment" id="alignment-columns">
                                     <property name="visible">True</property>
+                                    <property name="can_focus">False</property>
                                     <property name="left_padding">12</property>
                                     <child>
                                       <object class="GtkScrolledWindow" id="scrolledwindow-columns">
@@ -326,12 +388,17 @@
                                           <object class="GtkTreeView" id="treeview-columns">
                                             <property name="visible">True</property>
                                             <property name="can_focus">True</property>
+                                            <child internal-child="selection">
+                                              <object class="GtkTreeSelection" id="treeview-selection1"/>
+                                            </child>
                                           </object>
                                         </child>
                                       </object>
                                     </child>
                                   </object>
                                   <packing>
+                                    <property name="expand">False</property>
+                                    <property name="fill">True</property>
                                     <property name="position">2</property>
                                   </packing>
                                 </child>
@@ -342,17 +409,22 @@
                         <child type="label">
                           <object class="GtkLabel" id="label-information">
                             <property name="visible">True</property>
+                            <property name="can_focus">False</property>
                             <property name="label" translatable="yes">&lt;b&gt;Information&lt;/b&gt;</property>
                             <property name="use_markup">True</property>
                           </object>
                         </child>
                       </object>
                       <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
                         <property name="position">0</property>
                       </packing>
                     </child>
                   </object>
                   <packing>
+                    <property name="expand">False</property>
+                    <property name="fill">True</property>
                     <property name="position">2</property>
                   </packing>
                 </child>
@@ -361,6 +433,7 @@
             <child type="tab">
               <object class="GtkLabel" id="label">
                 <property name="visible">True</property>
+                <property name="can_focus">False</property>
                 <property name="label" translatable="yes">Settings</property>
               </object>
               <packing>
@@ -380,33 +453,10 @@
               <placeholder/>
             </child>
           </object>
-          <packing>
-            <property name="position">1</property>
-          </packing>
-        </child>
-        <child internal-child="action_area">
-          <object class="GtkButtonBox" id="dialog-action_area">
-            <property name="visible">True</property>
-            <property name="layout_style">end</property>
-            <child>
-              <object class="GtkButton" id="button-close">
-                <property name="label">gtk-close</property>
-                <property name="visible">True</property>
-                <property name="can_focus">True</property>
-                <property name="receives_default">True</property>
-                <property name="use_stock">True</property>
-              </object>
-              <packing>
-                <property name="expand">False</property>
-                <property name="fill">False</property>
-                <property name="position">0</property>
-              </packing>
-            </child>
-          </object>
           <packing>
             <property name="expand">False</property>
-            <property name="pack_type">end</property>
-            <property name="position">0</property>
+            <property name="fill">True</property>
+            <property name="position">1</property>
           </packing>
         </child>
       </object>